7-Zip is a file archiver with a high compression ratio. 7-Zip is free software with open source. The most of the code is under the GNU LGPL license. Some parts of the code are under the BSD 3-clause License.
Main features: High compression ratio in 7z format with LZMA and LZMA2 compression, Supported formats: Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM, Strong AES-256 encryption in 7z and ZIP formats.