It is not always easy to navigate between the multiple compression formats found on the web. Stuffit Expander is the historical Mac benchmark for archive decompression.
The software can extract archive files from many formats including essential SIT, ZIP, TAR, GZ, or Rar. Stuffit Expander integrates with the system and associates with archives, but you can also launch the software and extract any archive by simply dragging and dropping in the software window. Stuffit Expander can also automatically mount disk images extracted from archives and run an automatic scan with the antivirus of your choice.