| Unegg Project | 1 | 1 |
| Ungit Project | 1 | 1 |
| Uni-stuttgart | 1 | 1 |
| Uni-vert | 1 | 2 |
| Unica | 1 | 2 |
| Unicenter | 10 | 16 |
| Unichat | 1 | 1 |
| Unicode | 3 | 26 |
| Unicode Project | 1 | 3 |
| Unicon-imc2 | 1 | 1 |
| Unicon-software | 2 | 2 |
| Unicore | 1 | 1 |
| Unicorn-engine | 1 | 7 |
| Unicorn-list Project | 1 | 1 |
| Unicreditgroup | 1 | 1 |
| Unicycle Project | 1 | 1 |
| Uniden | 1 | 1 |
| Unidocs | 4 | 4 |
| Unidomedia | 1 | 1 |
| Unifi | 2 | 4 |
| Unified-automation | 1 | 1 |
| Unifiedoffice | 1 | 1 |
| Uniformserver | 1 | 1 |
| Uniforum | 1 | 2 |
| Unify | 25 | 57 |
| Unijimpe | 1 | 4 |
| Unilogies | 1 | 9 |
| Unimo | 6 | 6 |
| Unimo Technology Co., Ltd | 1 | 1 |
| Uninet | 1 | 1 |
| Uninett | 3 | 15 |
| Unioncms Project | 1 | 1 |
| Unionpayintl | 1 | 3 |
| Uniqkey | 1 | 28 |
| Uniqlo | 1 | 2 |
| Uniqlo Co., Ltd. | 1 | 2 |
| Unique Ads | 1 | 1 |
| Unisharp | 1 | 1 |
| Unisoc | 17 | 7013 |
| Unisoc (shanghai) Technologies Co., Ltd. | 1 | 327 |
| Unisoft | 1 | 2 |
| Unisoon | 2 | 6 |
| Unisor Cms | 1 | 1 |
| Unisys | 17 | 27 |
| Unit4 | 5 | 14 |
| Unitecms | 2 | 5 |
| United-security-providers | 1 | 1 |
| Unitedecu | 1 | 1 |
| Unitedhawknation | 1 | 1 |
| Unitedplanet | 1 | 3 |
| Unitegallery | 1 | 5 |
| Unitree | 2 | 2 |
| Unitrends | 2 | 13 |
| Unitronics | 1 | 4 |
| Unity | 1 | 5 |
| Unity3d | 1 | 2 |
| Unity8 | 1 | 3 |
| Univa | 1 | 6 |
| Univention | 1 | 2 |
| Univention Corporate Server | 1 | 1 |
| Universal Ircd | 1 | 9 |
| Universal Office Converter Project | 1 | 1 |
| Universal Robots | 5 | 6 |
| Universal Robots A/s | 2 | 2 |
| Universal-omega | 1 | 1 |
| Universal-robots | 10 | 26 |
| Universe | 1 | 1 |
| Universibo | 1 | 1 |
| Universis | 2 | 2 |
| University College London | 1 | 1 |
| University Of Arizona | 1 | 7 |
| University Of British Columbia | 1 | 1 |
| University Of California | 1 | 2 |
| University Of Cambridge | 1 | 21 |
| University Of Glasgow | 1 | 1 |
| University Of Kansas | 1 | 15 |
| University Of Massachusetts | 1 | 1 |
| University Of Minnesota | 3 | 29 |
| University Of Queensland | 1 | 1 |
| University Of Washington | 11 | 56 |
| Uniview | 5 | 5 |
| Uniwill | 1 | 1 |
| Uniwin | 1 | 3 |
| Unix | 1 | 67 |
| Unix4lyfe | 1 | 3 |
| Unixodbc | 1 | 5 |
| Unixware | 1 | 2 |
| Unknown | 1214 | 9428 |
| Unknown Domain | 1 | 9 |
| Unlcms | 1 | 2 |
| Unleashedmind | 1 | 2 |
| Unlimited Popups Project | 1 | 1 |
| Unlimited-elements | 1 | 1 |
| Unolabo Project | 1 | 1 |
| Unpoly | 1 | 1 |
| Unraid | 1 | 2 |
| Unreal | 1 | 9 |
| Unrealircd | 1 | 10 |
| Unrtf Project | 1 | 4 |
| Unsafe Accessor Project | 1 | 1 |
