bzip2 is described as 'file compressor that uses the Burrows–Wheeler algorithm. It is only a compressor for single files and not a full archiver' and is an app in the File Management category. There are five alternatives to bzip2 for a variety of platforms, including Linux, Mac, Windows, BSD and Haiku. The best alternative is DAR, which is both free and Open Source. Other great apps like bzip2 are gzip (Free, Open Source), XZ Utils (Free, Open Source), zlib (Free, Open Source) and LZ4 (Free, Open Source).
XZ Utils is free general-purpose data compression software with high compression ratio. XZ Utils were written for POSIX-like systems, but also work on some not-so-POSIX systems. XZ Utils are the successor to LZMA Utils.
zlib is a software library used for data compression. It is an abstraction of the DEFLATE compression algorithm used in gzip file compression program. zlib is also a crucial component of many software platforms including Linux, Mac OS X, and iOS.