1.github
https://github.com/justjavac/free-programming-books-zh_CN
Programming languages, WEB, function, big data, operating system, online courses, books database
2. Mount Dove
3. Turing community
Although many can not be downloaded directly, but it is quite easy to find the book.
4.w3c
https://www.w3cschool.cn/tutorial
5. rookie Tutorial
6. The control computer books
No longer support download
Recommended 1/2