7-Zip is a file archiver with a high compression ratio and is open source software. Most of the source code is under the GNU LGPL license. The unRAR code is under a mixed license: GNU LGPL + unRAR restrictions. Check license information here: 7-Zip license.
What"s new:
- ZIP / PPMd compression ratio was improved in Maximum and Ultra modes.
- The BUG in 7-Zip 9.* beta was fixed: LZMA2 codec didn"t work, if more than 10 threads were used (or more than 20 threads in some modes).