The Csound FLOSS Manual has a new release (8.1) which includes these novelties:

• Csound 7 (beta) is now under the hook, so you can try out any Csound 7 code.
• There is a chapter in the appendix which explains some of the new features in Csound 7.
• There is a french translation now, thanks to Xavier Dole, mostly containing the Getting Started. The direct link to the first chapter is here.

Enjoy!