7-Zip is total 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.
Also there is unRAR license restriction for some parts of the code.
Supported System
7-Zip works in Windows 10 / 8 / 7 / Vista / XP
The main features of 7z format:
- Open architecture
- Better compression ratio
- Strong AES-256 encryption
- Ability of using any compression, conversion or encryption method
- Supporting files with sizes up to 16000000000 GB
- Solid compressing
- Archive headers compressing