Another interesting compression project is "Zstandard"
Open source, high performance, decent compression and a "dictionary mode" that's especially fun when it comes to compressing a lot of small data.
Previous discussion over at https://news.ycombinator.com/item?id=8941955
Also lzturbo is very interesting, closed source but you one can download exec:
https://sites.google.com/site/powturbo/
https://github.com/powturbo/TurboBench