This program is a decompression/compression utility that is permantently free to try, but gives a annoying popup after 30 days. You still will have full use of the program, but will have to look at the popup. Its an amazingly fast program that can compress to Zip or Rar format and decompress CAB, ARJ, LZH, TAR, GZ, ACE, UUE, BZ2, JAR, ISO, 7Z, and Z compression types. Its site is located here.
Also you can grab it here.