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 |
|---|---|---|
| No Retreat! | GMT Games | Donald Stone |
| No Retreat: The North African Front | ||
| Norman Conquests | GMT Games | |
| Norman Conquests | GMT Games | |
| Normandy '44 | GMT Games | |
| North Africa '41 | GMT Games | |
| Not War But Murder | Against the Odds | Judd Vance |
| Not War But Murder | Against the Odds | Judd Vance, Tom Cundiff |
| Nothing Gained But Glory - Halmstad-Warksow | GMT Games | Knut Gruenitz |
| Nothing Gained But Glory - Lanskrona | GMT Games | Knut Gruenitz |
| Nothing Gained But Glory - Lund | GMT Games | Knut Gruenitz |
| Nothing Gained But Glory - Malmoe | GMT Games | Knut Gruenitz |
| Nothing Gained But Glory - Nyborg-Fehrbellin | GMT Games | Knut Gruenitz |
| Novi 1799 | Acies Edizioni | Andrea Magno |
| Obbedisco! | Acies Edizioni | Pierre Bulle |
| Onslaught | Simulations Publications, Inc., TSR | |
| Operation Battleaxe | Revolution Games | Peter Bennett, Judd Vance |
| Operation Dauntless | GMT Games | |
| Operation Edelweiss | Clash of Arms | Peter Dietrich |
| Operation Mercury | GMT Games | |
| Operation Roundup | Against the Odds | Dave Jones |
| Pacific Islands Campaign: Iwo Jima | Grognard Simulations Inc. | Antonio Pinar Peña |
| Pacific War | ||
| Pacific War | GMT Games, Victory Games | |
| Panzer | GMT Games | Rob Doane |
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