| Underdock | 1 | 1 |
| Underscore-99Xp Project | 1 | 1 |
| Underscore-Keypath Project | 1 | 1 |
| Underscorejs | 1 | 1 |
| Undolog | 3 | 3 |
| Undsgn | 1 | 3 |
| Unegg Project | 1 | 1 |
| Unfocus | 1 | 1 |
| Ungit Project | 1 | 1 |
| Uni | 1 | 1 |
| Uni-Stuttgart | 1 | 1 |
| Uni-Vert | 1 | 2 |
| Uni-Yaz | 1 | 1 |
| Unica | 1 | 3 |
| Unicenter | 10 | 10 |
| Unichat | 1 | 1 |
| Unicode | 3 | 4 |
| Unicode Project | 1 | 1 |
| Unicon-Imc2 | 1 | 1 |
| Unicon-Software | 2 | 2 |
| Uniconsent | 1 | 1 |
| Unicore | 1 | 1 |
| Unicorn-Engine | 1 | 7 |
| Unicorn-List Project | 1 | 1 |
| Unicreditgroup | 1 | 1 |
| Unicycle Project | 1 | 1 |
| Uniden | 1 | 1 |
| Unidocs | 3 | 3 |
| Unidomedia | 1 | 1 |
| Unified-Automation | 2 | 3 |
| Unifiedoffice | 1 | 1 |
| Unifiedremote | 1 | 2 |
| Uniformserver | 1 | 1 |
| Uniforum | 1 | 2 |
| Unify | 17 | 27 |
| Uniguest | 1 | 3 |
| Unihost | 1 | 1 |
| Unijimpe | 1 | 1 |
| Unimo | 6 | 12 |
| Uninet | 1 | 1 |
| Uninett | 2 | 11 |
| Unioncms Project | 1 | 1 |
| Uniong | 1 | 1 |
| Unionman | 1 | 1 |
| Unionpayintl | 1 | 3 |
| Uniqkey | 1 | 3 |
| Uniqlo | 1 | 2 |
| Unique Ads | 1 | 1 |
| Unisharp | 2 | 2 |
| Unisoc | 14 | 14 |
| Unisoft | 1 | 2 |
| Unisoon | 1 | 3 |
| Unisor Cms | 1 | 1 |
| Unistra | 1 | 1 |
| Uniswap | 5 | 5 |
| Uniswapfrontrunbot Project | 1 | 1 |
| Unisys | 16 | 26 |
| Unit4 | 5 | 9 |
| Unitecms | 1 | 3 |
| United-Security-Providers | 1 | 1 |
| Unitedecu | 1 | 1 |
| Unitedhawknation | 1 | 1 |
| Unitedplanet | 1 | 3 |
| Unitedthemes | 2 | 3 |
| Unitegallery | 1 | 4 |
| Unitree | 2 | 3 |
| Unitrends | 2 | 10 |
| Unitronics | 19 | 22 |
| Unitronicsplc | 1 | 1 |
| Unity | 2 | 2 |
| Unity3D | 1 | 2 |
| Unity8 | 1 | 1 |
| Univa | 1 | 1 |
| Univention | 2 | 3 |
| Univera | 1 | 1 |
| Universal Ircd | 1 | 8 |
| Universal Office Converter Project | 1 | 1 |
| Universal Star Rating Project | 1 | 1 |
| Universal-Robots | 3 | 6 |
| Universe | 1 | 1 |
| Universibo | 1 | 1 |
| Universis | 2 | 2 |
| University College London | 1 | 1 |
| University Compass Project | 1 | 1 |
| University Information Management System Project | 1 | 1 |
| University Of Arizona | 1 | 1 |
| University Of British Columbia | 1 | 1 |
| University Of California | 1 | 2 |
| University Of Cambridge | 1 | 10 |
| University Of Glasgow | 1 | 1 |
| University Of Kansas | 1 | 6 |
| University Of Massachusetts | 1 | 1 |
| University Of Minnesota | 3 | 9 |
| University Of Queensland | 1 | 1 |
| University Of Washington | 11 | 33 |
| Uniview | 6 | 6 |
| Uniwayinfo | 5 | 11 |
| Uniwill | 1 | 1 |
| Uniwin | 1 | 3 |
| Unix | 1 | 2 |
