7-zip Review !

7-Zip is one of the most well known and popular archivers around due to the 7z archive format which compresses files into much smaller sizes than ZIP. Being open source, 7z is now found in most other free and paid archiving applications. The stable version 9.20 has not been updated since 2010, but there are several newer alpha builds that keep development slowly moving. 7-Zip can compress to 7 formats and decompress to another 25 or so, including WIM, CAB, MSI, MBR and and VHD files. It’s also very useful to extract the contents of setup installers.

Version tested: 9.20 (64-bit)
Omni.ja Support: No (Yes in 9.32 alpha)
Price: Free
Max Compression used: 7z Ultra LZMA2