Freeware: Compression / Decompression:

7-zip - 7-zip.org/
bzip2 - sources.redhat.com/bzip2/index.html
ExtractNow - extractnow.com/
FilZip - filzip.com/
Info-Zip - info-zip.org/
IZArc - florida.plus.com/izarc/
QuickZip - quickzip.org/
TUGZip - tugzip.com/
UPX - upx.sourceforge.net/
Zip&Go - handybits.com/zipngo.htm
Zipgenius - zipgenius.it/