Sponsored by 
Vassal
VASSAL is an open-source game engine which allows users to both play in real time (over a live Internet connection) and as PBeM ( via email). It runs on all platforms, and is free for personal use.
The files that are created/used for each individual game title are known as 'mods'.
Vassal is extremely popular amongst wargamers and, of all the games engines, probably has the greatest number of games supported. Creating 'mods' is more technical than for either Cyberboard or ZunTzu.
The software can be download from the VASSAL Website.
| Title | Publisher | Author |
|---|---|---|
| This Accursed Civil War III: Naseby | GMT Games | Knut Gruenitz |
| This Accursed Civil War IV: Marston Moor | GMT Games | Knut Gruenitz |
| This Accursed Civil War V: 2nd Newbury | GMT Games | Knut Gruenitz |
| This Accursed Civil War VI: Cheriton | GMT Games | Knut Gruenitz |
| This War Without an Enemy | Nuts! Publishing | |
| Three Days of Gettysburg | GMT Games | |
| Thunder at Dawn | Revolution Games | Richard Handewith |
| Thunder in the Ozarks | Revolution Games | Stephen Oliver |
| Time of Crisis | GMT Games | |
| To The Far Shore | World Wide Wargames | Peter Dietrich |
| To the Last Man | Nuts! Publishing | |
| To the Last Man | ||
| Tonkin | Legion Wargames | Stan Hilinski |
| Totaler Krieg (2nd Edition) | Decision Games | |
| Toulon 1793 | Legion Wargames | Peter Bennett |
| Trautenau & Soor | Vae Victis | Noel Wright |
| Trenches of Valor | Victory Point Games | Art Bennett |
| Trenches of Valor | Victory Point Games | |
| Triumph & Tragedy | GMT Games | |
| Triumph of Chaos | Clash of Arms | Mark Beninger |
| Triumph of Chaos v2 Deluxe | Clash of Arms | Dave Jones |
| Turkenkrieg | Red Sash Games | Miguel Angel Sanchez |
| Twilight Struggle | GMT Games | Tim McCarron |
| Typhoon | GMT Games | |
| Ukraine 43 | GMT Games | Bob Schindler |
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