| Title | System | Year | |
|---|---|---|---|
| Free Game Empire | UFO: Enemy Unknown | PC | |
| DJ Old Games | X-COM: UFO Defense | unknown | 1994 |
| RetroGames.cz | UFO: Enemy Unknown | PC | 1994 |
| XTC Abandonware | X-Com - UFO Defense \(Win\) | PC | 1993 |
| The House of Games | UFO: enemy unknown | unknown | 1994 |
| GamesWin | X-COM (Collector's Edition) | PC | 1997 |
| XTC Abandonware | X-COM - UFO Defense \(DOS\) | PC | 1994 |
| Just Games Retro | X-COM: UFO Defense / UFO: Enemy Unknown | PC | 1994 |
| The Good Old Days | UFO: Enemy Unknown | PC | 1994 |
| GamesWin | X-COM: UFO Defense (UFO: Enemy Unknown) | PC | 1994 |
| Archive.org | UFO - Enemy Unknown | PC | 1994 |
| Lostgames Abandonware | UFO: Enemy Unknown | PC | 1994 |
| A Force For Good | UFO: Enemy Unknown | PC | 1994 |
| The Retro Spirit | UFO: Enemy Unknown | PC | 1994 |
| Games Nostalgia | X-COM: UFO Defense | PC | 1993 |
| Free Online Games | UFO Enemy Unknown | PC | 1993 |
| Title | Genre | Company | Year |
|---|---|---|---|
| Navcom 6 - The Persian Gulf Defense | Simulation | Cosmi Corporation | 1988 |