1. Source code download
A very popular source code hosting website, there are many famous source code in it, and there are also many self-written and uploaded ones, which can be searched directly
https: //github.comClick to open the link
2. A foreigner's blog with cross-compilation tools
http://landley.net/Click to open the link
3. Learning Websites
http://www.runoob.com/Click to open the link
4. I used it when I was looking for google dns at first. There are a lot of things in it.
https://laod.cn/Click to open the link
5. E-book download, no need for points, cool
http://itbook.topClick to open the link