> Oodle is a family of data compression solutions with incredible world-beating performance. Make your game smaller to download, make your levels load faster, and compress your network packets for better player experience and to save money on bandwidth! Oodle slashes the time from download to playing the game.

http://www.radgametools.com/oodle.htm

Just discovered this the other day:

https://github.com/powzix/ooz

Have not checked the quality, but probably concrete details about what is being talked about high-level in the article.

The decompressors in ooz work great; I've used it to analyze data files in a game.

Unfortunately, there's currently no compression support short of calling into the vendor DLL.