Letter U
| U++ | 1 project |
| uav | 1 project |
| ubercart | 1 project |
| ubiquitous computing | 1 project |
| Ubuntu | 131 projects |
| Ubuntu (Unity) | 5 projects |
| Ubuntu Linux | 69 projects |
| Ubuntu LTS | 3 projects |
| uchannel | 1 project |
| UCI License (BSD-like) | 3 projects |
| uClibc | 5 projects |
| ucsd.tv | 1 project |
| udev | 2 projects |
| UDF | 1 project |
| UDID | 1 project |
| udisks | 1 project |
| udp | 10 projects |
| UDP Hole Punching | 2 projects |
| udp load balancing | 1 project |
| UDP/IP | 2 projects |
| UDP/IP Syslog | 1 project |
| UDT | 1 project |
| UI | 9 projects |
| UI Validation | 1 project |
| Uighur | 1 project |
| UIMA | 3 projects |
| Ujorm | 3 projects |
| uk | 2 projects |
| UK English | 1 project |
| Ukrainian | 122 projects |
| Ukranian | 5 projects |
| Ultrasonic | 1 project |
| ultrastar | 1 project |
| ULTRIX | 3 projects |
| uml | 13 projects |
| uml modeling | 7 projects |
| uml tool | 4 projects |
| umount | 1 project |
| UMTS | 4 projects |
| undelete | 2 projects |
| Ungarian | 1 project |
| Unicode | 13 projects |
| Unicon | 1 project |
| Uniden | 1 project |
| unified communicatons | 1 project |
| Unihan | 1 project |
| union | 1 project |
| unison | 1 project |
| unit conversion | 1 project |
| Unit test | 9 projects |
| Unit Testing | 10 projects |
| units | 1 project |
| unittest | 1 project |
| unity | 6 projects |
| Unity3d | 1 project |
| universal | 1 project |
| Universal Program License | 1 project |
| University | 5 projects |
| University of Illinois/NCSA Open Source License | 1 project |
| UnivIS | 1 project |
| Unix | 5029 projects |
| Unix (Mono) | 2 projects |
| UNIX / Linux | 74 projects |
| UNIX Automated Inventory / Performance Monitoring / Trend Analysis | 1 project |
| unix command line | 7 projects |
| UNIX Linux | 2 projects |
| Unix Shell | 1063 projects |
| UNIX support | 1 project |
| unix tool | 8 projects |
| Unix-like | 62 projects |
| UNIX-like OSs | 53 projects |
| Unix/Linux | 27 projects |
| Unix/Linux Commands | 1 project |
| UnixWare | 2 projects |
| Unknown | 14 projects |
| unleashx | 1 project |
| Unlicense | 4 projects |
| Unmaintained | 1 project |
| unmounting | 1 project |
| Uno | 1 project |
| Unorthodox | 1 project |
| untrusted code execution | 1 project |
| UPC | 1 project |
| Update | 2 projects |
| update MSG file | 1 project |
| update web page | 1 project |
| update website | 1 project |
| Updates | 3 projects |
| Upgrade | 2 projects |
| upload | 12 projects |
| upload file | 1 project |
| upload image | 3 projects |
| upload images | 1 project |
| upload script | 1 project |
| upload sharepoint | 1 project |
| upload webdav | 1 project |
| uploader | 5 projects |
| uploading | 4 projects |
| upnp | 8 projects |
| Upper Sorbian | 1 project |
