Privacy oriented services
These services are privacy oriented. None of them tracks you or even store logs in my server. So you can use them safely. Please, don't abuse of them. See more information in privacy notice and terms of use.
It's recommended you use TOR Browser and use the Onion links to ensure you are in full anonymity.
The CXXREF project
A libre documentation and reference for the C and C++ programming languages based on GCC, the GNU Libc and the GNU Standard C++ Library.
There's a lot work in progress. So please feel free to fork it and contribute to it by making pull requests, or by reporting issues.
You can see the site here. Or see the source code of the project here. It also has a Onion address
This project is governed under another privacy notice (which is also privacy friendly) and terms of usage. You can even host your own mirrors if you want.