Universal Extractor does exactly what it says: Extracts from any type of archive.
You may wonder “well, I’ve got 7-Zip/WinZip/Winrar/whatever, why do I need this?” The great thing about this program is that it can actually extract files from installation packages, which can be useful in various cases — testing for portability, scanning for viruses, or just having trouble with the installer itself.
(I did run into one glitch: On some older, 16-bit installers, it won’t extract the files. No big deal, though. Does anybody even use 16-bit programs anymore?)