- Harpoon - 1989
- Harpoon Challenger Pack - 1991
- Harpoon Classic - 1994
- Harpoon Classic 97 - 1996
- Larry Bond's Harpoon Commander's Edition (HCE) - 2007
- Harpoon II - 1994
- Harpoon II: Admiral's Edition - 1996
- Harpoon III - 2001
- Harpoon 3 Pro - 2001
- Larry Bond's Harpoon 3: Advanced Naval Warfare (ANW) - 2006
Basically, there are two types/streams of computer Harpoon - Classic and Harpoon II/III. They both try to simulate naval warfare, but do it in different ways. The best analogy is to compare them with Squash and Racquetball.
I have sorted out the variants a bit for you. The Harpoon Classic started in 1989 and evolved to the current HCE version. Harpoon II line started in 1994 and the latest version is ANW. You can read about the history here:
http://wiki.computerharpoon.com/inde...le=Harpoon_4.1
Both HCE and ANW have community mods, databases, scenarios, and support. Demo versions for both are also available. At this time, the only available options are HCE or ANW. The H2/H3 versions are no longer sold (except maybe eBay.)