brotli : Generic-purpose lossless compression algorithm ( https://github.com/google/brotli )
lzop : Utility for fast (even real-time) compression/decompression ( http://www.lzop.org/ )
zstd : zstd fast compression library ( https://facebook.github.io/zstd/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a prototype99
For Paludis use this rsync : rsync://gentoo.zugaina.org/prototype99-portage
If you have a problem : ycarus(-at-)zugaina.org