| Unshield Project | 1 | 1 |
| Unscripts | 1 | 1 |
| Unsanity | 1 | 1 |
| Unsafe Accessor Project | 1 | 1 |
| Unpoly | 1 | 1 |
| Unolabo Project | 1 | 1 |
| Unlimited Popups Project | 1 | 1 |
| Unknown-o | 1 | 1 |
| Unknown-corp | 1 | 1 |
| Unizoewebsolutions | 1 | 1 |
| Unixware | 1 | 1 |
| Uniwill | 1 | 1 |
| University Of Queensland | 1 | 1 |
| University Of Massachusetts | 1 | 1 |
| University Of Glasgow | 1 | 1 |
| University Of British Columbia | 1 | 1 |
| University Information Management System Project | 1 | 1 |
| University Compass Project | 1 | 1 |
| University College London | 1 | 1 |
| Universibo | 1 | 1 |