Genozip is a new(ish) compression software for compressing genomic files. It usually compresses x2-x5 times better than standard compression (eg .gz), and it works on all common genomic file formats. I am its developer.
It is a lot more than just a compressor though, it has some interesting analytical capabilities too.
Installation, documentation and source code: http://genozip.com
Publication: A Universal Extensible Genomic Data Compressor
Feedback / feature requests would be more than welcome.
Note: this tool is not open source, but it is free for non-commercial use, and the source code is available.