YouTube to MP3

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.

混合盘是一款规则引擎APP,可以将任何搜索网站制作成规则,供用户聚合搜索使用,混合盘搜索是一个百度网盘、夸克网盘、阿里云盘资源搜索引擎，提供百度网盘资源搜索、夸克网盘资源搜索、阿里云盘资源搜索等服务。

Filmot - Search in Youtube captions and subtitles

Freesound: collaborative database of creative-commons licensed sound for musicians and sound lovers. Have you freed your sound today?