[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-info-chinatextbook":3},{"site":4,"relatedSites":23},{"id":5,"site_id":6,"site_name":7,"site_url":8,"page_url":9,"title":10,"description":11,"screenshot":9,"icon":12,"labels":13,"language":14,"rank":15,"rating":16,"content":17,"show_content":18,"created_time":19,"updated_time":20,"user_id":21,"enable":18,"category":22},3352,"chinatextbook","ChinaTextbook","https:\u002F\u002Fgithub.com\u002FTapXWorld\u002FChinaTextbook","","ChinaTextbook: All Primary, Secondary, High School, and University-Level PDF Textbooks","An open-source mathematics textbook project dedicated to promoting educational equity, offering PDF resources from primary school to university levels. It features automated merging of split PDF files, serving families and students worldwide.","https:\u002F\u002Fgithub.githubassets.com\u002Ffavicons\u002Ffavicon-dark.svg","[\"free\", \"open source\"]","en",11,10,"## Breaking Down Educational Barriers with Open Source: A Mathematics Textbook Initiative for Universal Access\n\nIn the digital age, educational resources should be more accessible and equitable. Yet, many high-quality materials remain fragmented across platforms or restricted by artificial barriers, making them difficult for the general public to obtain. Worse, some textbook resources are watermarked and resold at exorbitant prices on e-commerce platforms.\n\nTo address this issue, an open-source educational project has emerged, targeting all citizens - particularly overseas Chinese families. This initiative systematically organizes mathematics textbooks from primary school to university level, freely shared through public repositories to promote educational equity and improve resource distribution across regions.\n\n## Project Background and Origins\n\nAlthough numerous official and non-official platforms have opened up compulsory education resources, users still face limitations from platform restrictions, network environments, and information retrieval capabilities. This information asymmetry leads to the 'commodification' of educational resources, contradicting the principle of public education.\n\nMore importantly, overseas Chinese families desperately want their children to continue receiving Chinese basic education, especially maintaining the domestic teaching system in core subjects like mathematics. This open-source project aims to build a bridge in this context.\n\n## Project Resource Overview\n\nThe project covers mathematics textbooks from primary to university levels, organized by semester and difficulty level with clear structures and abundant resources:\n\n### Primary School Mathematics (Grades 1-6)\n\n* Full PDF files for both semesters\n* Corresponding to national compulsory education textbook editions\n\n### Middle School Mathematics (Grades 7-9)\n\n* Organized according to the nine-year compulsory education curriculum\n* Each volume is independently labeled for easy reference and printing\n\n### High School Mathematics\n\n* Includes core and elective modules\n* Covers key topics like functions, analytical geometry, and derivatives\n\n### University Mathematics\n\n* Advanced Mathematics\n* Linear Algebra\n* Discrete Mathematics\n* Fundamentals of Probability Theory\n* Additional materials sourced from open mathematics communities\n\n## Technical Solution: Merging Large Files\n\nConsidering GitHub's 100MB file size limit, some textbooks are split into multiple files under 50MB, such as:\n\n```\nmath_grade1_term1.pdf.1\nmath_grade1_term1.pdf.2\n```\n\nTo address this, developers provided a small merging tool: `mergePDFs.exe`. Users simply place this tool in the directory containing the PDF fragments, run it, and the system automatically merges the files.\n\n### Simple Usage Guide:\n\n1. Download the [`mergePDFs.exe`](#) program\n2. Place it in the folder containing split files\n3. Double-click to run, allowing the system to automatically identify and merge files\n4. Generate complete PDF files without modifying original documents\n\nThis approach significantly improves accessibility for users without professional tools, enhancing the project's practicality and usability.\n\n## Download Recommendations for Global Users\n\n### Domestic Users:\n\nUse the community project [tchMaterial-parser](https:\u002F\u002Fgithub.com\u002Fxxx\u002FtchMaterial-parser) to automatically download original textbook resources. The fully open-source code supports batch downloading and updates.\n\n### Overseas Users:\n\nDue to network restrictions accessing domestic resources, it's recommended to directly obtain compressed packages from this GitHub repository or clone the entire project using a Git client. This minimizes issues with mid-process disconnections or speed limitations.\n\n## Social Impact and Future Vision\n\nUnder the exam-oriented education system, learning often becomes a tool. However, this project expresses a more pure vision: hoping to foster more individuals like the self-taught \"middle school ginger sprout\" who learn out of genuine interest rather than just for exams.\n\nThis project is not merely a textbook collection but a technical implementation of the 'educational public welfare' concept. It focuses not only on educational content itself but also on the accessibility of education, which is particularly significant for families restricted by geography, identity, or language.",true,"2025-05-13T14:14:53.919+00:00","2025-05-25T02:00:49.624692+00:00","0580a0c4-ab45-4e43-bf0e-2ff9a2039cb1","resource_downloads",[24,38,51,63],{"id":25,"site_id":26,"site_name":27,"site_url":28,"page_url":29,"title":30,"description":31,"icon":32,"labels":33,"language":14,"rank":15,"created_time":34,"updated_time":35,"user_id":29,"enable":18,"screenshot":29,"content":36,"show_content":18,"rating":37},3332,"datatool.vip","DataTool.vip","https:\u002F\u002Fwww.datatool.vip\u002F",null,"DataTool.vip - A Free Online Video Downloader Supporting Multiple Platforms","DataTool.vip is a powerful free online video downloader supporting over 40 platforms including TikTok, Instagram, YouTube, and Twitter. It offers 4K resolution downloads, watermark removal, and fast processing. No software installation required - simply paste a video link to download.","https:\u002F\u002Foss.snappdown.com\u002Fprod\u002Fdatatool\u002Fimg\u002Ffavicon.ico","[\"video downloader\",\"social media\",\"content creation\",\"free tool\",\"watermark remover\"]","2025-05-12T14:50:11.703441+00:00","2025-05-19T16:50:53.837506+00:00","## Introduction\nDataTool.vip is a versatile online video downloader that simplifies saving videos from various social media platforms. With support for over 40 websites, it has become the preferred solution for content creators, marketers, and everyday users.\n\n## Features\n- **Multi-platform Support**: Compatible with TikTok, Instagram, YouTube, Twitter, Facebook, and more\n- **High-quality Downloads**: Supports 4K resolution for crystal-clear video quality\n- **Watermark Removal**: Option to download videos without platform identifiers\n- **Fast Processing**: Optimized engine ensures efficient video parsing and download performance\n- **No Installation Required**: Fully web-based online tool\n- **Audio Extraction**: Can extract audio tracks from videos\n\n## How to Use\n1. Visit datatool.vip\n2. Paste the video link into the input field\n3. Select download options (resolution, watermark settings)\n4. Click download\n\n## Conclusion\nWhether content creators need reference materials, marketers analyzing competitors, or everyday users wanting to save favorite videos, DataTool.vip provides a simple, free solution. It enables high-quality video downloads from nearly any platform with exceptional speed and convenience.",9,{"id":39,"site_id":40,"site_name":41,"site_url":42,"page_url":9,"title":43,"description":44,"icon":45,"labels":46,"language":14,"rank":16,"created_time":47,"updated_time":48,"user_id":21,"enable":18,"screenshot":49,"content":50,"show_content":18,"rating":16},6785,"edu.52it","Student Free Resources","https:\u002F\u002Fedu.52it.de\u002F","a one-stop hub for students to access powerful tools","**edu.52it.de** is a one-stop hub for students to access powerful tools, AI services, and premium software at little or no cost—just by verifying student status. It’s a must-bookmark site for every student who wants to boost productivity without breaking the bank.","https:\u002F\u002Fedu.52it.de\u002Ffavicon.ico","[\"ai\", \"free\", \"student\"]","2025-05-31T06:33:04.279+00:00","2025-05-31T06:38:24.074565+00:00","https:\u002F\u002Fr2.onlinestool.com\u002Fblog-covers\u002F1748673495232-qptletygb1.jpg","## 🎓 What is edu.52it.de?\n\n[**edu.52it.de**](https:\u002F\u002Fedu.52it.de\u002F) is a curated online platform that aggregates free resources and exclusive educational discounts for students worldwide. It is designed to help students easily discover tools, software, cloud services, and other benefits that are either completely free or significantly discounted with a valid student identity.\n\n---\n\n## 🔍 Who is it for?\n\nThis platform is ideal for:\n\n* University and high school students\n* Learners with a verified academic email (.edu or similar)\n* Self-learners seeking academic perks using student ID or school accounts\n\n---\n\n## 🌟 Key Categories and Offers\n\nThe platform features a wide range of resources, organized into the following categories:\n\n### 1. **Software Tools**\n\n* Microsoft Office 365\n* JetBrains All Products Pack\n* Figma\n* Notion\n* Canva\n* MATLAB\n* Navicat\n\n### 2. **AI Tools & Services**\n\n* ChatGPT Plus\n* Claude Pro\n* You.com Pro\n* Dify AI\n* IASK\n* Perplexity AI\n\n### 3. **Cloud & Development**\n\n* AWS Educate\n* Azure for Students\n* Autodesk Education\n* Cursor\n* Shapr3D\n\n### 4. **Productivity & Career**\n\n* GitHub Student Developer Pack\n* Kickresume\n* Miro\n* Beautiful AI\n* Yuque (语雀)\n\n### 5. **Shopping & Entertainment**\n\n* Amazon Prime Student\n* Apple Music Student Plan (with Apple TV+)\n* YouTube Premium Student Plan\n\n---\n\n## 🚀 How to Use\n\n1. Visit [https:\u002F\u002Fedu.52it.de\u002F](https:\u002F\u002Fedu.52it.de\u002F)\n2. Browse the resource list and select an offer\n3. Follow the guide to sign up or verify using a student email or academic credentials\n4. Start using the free or discounted service\n\n\n",{"id":52,"site_id":53,"site_name":54,"site_url":55,"page_url":9,"title":56,"description":57,"icon":58,"labels":59,"language":14,"rank":37,"created_time":60,"updated_time":61,"user_id":21,"enable":18,"screenshot":29,"content":62,"show_content":18,"rating":37},1998,"4kdownload","4K Download ","https:\u002F\u002Fwww.4kdownload.com\u002F-54","4KDownload - Free HD Video and Audio Download Tool","4KDownload supports HD video and audio downloads from multiple platforms like YouTube and Vimeo, offering batch downloads, subtitle fetching, and audio extraction features. With an ad-free and simple interface, experience efficient downloading now.","https:\u002F\u002Fstatic.4kdownload.com\u002Fmain\u002Fimg\u002Ffavicon.14dc87052228.ico","[\"video tool\",\"audio tool\"]","2025-05-01T15:02:50.15+00:00","2025-08-02T02:14:38.75869+00:00","## 4KDownload - Free Video Download Tool Supporting Multi-platform HD Video Parsing\n\n## What is 4KDownload?\n\n4KDownload is a website dedicated to downloading HD video and audio content. Users can easily save 4K, 1080p, 720p videos and high-quality audio from YouTube, Vimeo, Facebook, and other popular platforms to their local devices with 4KDownload. It mainly serves individual users, creators, and educators who need to watch, backup, edit, or collect online video materials offline. 4KDownload provides a simple and safe downloading process, making it convenient for more people to access the multimedia resources they need.\n\n## Why Choose 4KDownload? (or Main Advantages of 4KDownload)\n\nChoosing 4KDownload, users can enjoy an efficient video downloading experience. It supports multiple platforms, is ad-free, and has no unnecessary plugins, reducing common complexities and distractions in operations. 4KDownload also allows batch downloads, original quality saving, supports embedded subtitles, and audio track extraction. These features are significantly more convenient than many similar services, effectively saving operation time. The official website provides desktop applications and a web version, which can be used without registration, protecting users' privacy and freedom of use.\n\n## Core Features of 4KDownload\n\n- Feature 1: Multi-platform HD Video and Audio Download\n4KDownload supports mainstream video websites like YouTube, Vimeo, SoundCloud, Facebook, etc. Users only need to paste the video link, and the system will automatically parse and provide download options in different formats and resolutions, supporting up to 4K or even 8K resolution.\n\n- Feature 2: Batch and Channel Download\nUsers can download all video content in a playlist, channel, or favorites at once. This capability is especially suitable for users who need to systematically organize and save a large number of resources, such as collecting video tutorials or offline organizing music albums.\n\n- Feature 3: Subtitle Fetching and Embedding\n4KDownload supports fetching and exporting multilingual subtitles. Downloaded videos can have subtitles embedded or separated, which is extremely convenient for self-learning foreign languages or material organization.\n\n- Feature 4: Audio Extraction\nThe platform provides high-quality audio extraction services. Users can easily convert the audio in videos into common audio formats such as MP3 and M4A, suitable for users who only need music or lecture audio.\n\n- Feature 5: Ad-free, Simple Interface\nThe official website and client are ad-free, with no additional plugins. The interface design is suitable for both beginners and veterans, with an intuitive operation process to reduce the risk of misoperation.\n\n## How to Start Using 4KDownload?\n\n1. Visit the official website of 4KDownload (https:\u002F\u002Fwww.4kdownload.com\u002F).\n2. Download and install the application suitable for Windows, macOS, or Linux, or use the web version tool directly.\n3. Copy the link of the video or audio page you want to download.\n4. Open 4KDownload, paste the link into the input box, and click \"Download\".\n5. Select the required format and resolution, and confirm to download to the local computer.\n6. After the download is complete, you can find the video or corresponding audio file in the local folder.\n\n## Tips for Using 4KDownload\n\n- Tip 1: Use Shortcuts to Improve Efficiency\nIn the desktop application, shortcuts (such as Ctrl+V to paste the link) are supported to start batch downloads directly, saving time.\n\n- Tip 2: Utilize the Download Queue\nEnable the download queue function to add multiple tasks at once. It can avoid bandwidth congestion and is suitable for users who are batch organizing materials.\n\n## Frequently Asked Questions (FAQ) About 4KDownload\n\n- **Q: Is 4KDownload currently available?**\n  A: 4KDownload is currently available for normal use. Users only need to visit the official website or download the client to start the video and audio download service.\n\n- **Q: What exactly can 4KDownload help me do?**\n  A: 4KDownload can help you save HD videos and audio from the internet, including entire courses, music albums, instructional videos, live recordings, etc. You can watch them offline at any time, and it's also convenient for backup or video editing for secondary creation.\n\n- **Q: Do I need to pay to use 4KDownload?**\n  A: 4KDownload provides a basic free version, supporting common video and audio download functions. The paid Pro version offers higher download speeds, unlimited batch downloads, and other value-added services.\n\n- **Q: When was 4KDownload launched?**\n  A: 4KDownload was first launched around 2014. The website and software have been continuously updated over the years, compatible with new video platforms and content safety rules.\n\n- **Q: Compared with YTD Video Downloader, which one is more suitable for me?**\n  A: Both 4KDownload and YTD Video Downloader support online video downloads. 4KDownload supports more HD videos and batch downloads, with a relatively simple interface. YTD Video Downloader focuses on ease of use and quick conversion. If you value high-quality video downloads and subtitle management, 4KDownload is more suitable. If you prefer quick downloads of single files, YTD may be more convenient. The choice should be based on your own download needs.\n\n- **Q: Which devices and systems does 4KDownload support?**\n  A: 4KDownload provides a desktop version, supporting Windows, macOS, and Linux systems. There is also a web version tool that can be accessed directly through most mainstream browsers.\n\n- **Q: Can the videos I download be used for commercial purposes?**\n  A: 4KDownload only provides technical tools. The use of video or audio content should comply with the copyright regulations of the original platform, and usually cannot be used for unauthorized commercial purposes. It is recommended that users download content only for personal learning, reference, and collection purposes.",{"id":64,"site_id":65,"site_name":65,"site_url":66,"page_url":9,"title":67,"description":68,"icon":69,"labels":70,"language":14,"rank":37,"created_time":71,"updated_time":72,"user_id":21,"enable":18,"screenshot":9,"content":9,"show_content":73,"rating":74},3632,"bestvideow","https:\u002F\u002Fwww.bestvideow.com\u002F","Free Video parsing and download - TikTok, Bilibili video parsing and download tool - Best Video Downloader","Best Video Downloader is a powerful and free video parsing and downloading tool. It supports high-definition watermark-free downloading of videos from over 100 popular video platforms worldwide, including Bilibili, Douyin, Kuaishou, Weibo, Xiaohongshu, TikTok, YouTube, etc. The Best Video downloader does not require registration. It is easy to operate and has a fast download speed. It is an ideal choice for video downloading and moving.","https:\u002F\u002Fwww.bestvideow.com\u002Fimage\u002Flogomin.png","[\"video download\",\"free\", \"TikTok\", \"youtube\"]","2025-05-26T14:56:48.902+00:00","2025-05-31T14:05:47.963624+00:00",false,6]