| Subcategories | | THEOS@ | TI-99 4A@ | TRON@ | Tablature, Guitar@ | Tao Intent@ | Tape Backup@ |
| Tarot@ | Tax Accounting@ | Taxonomy, Biological@ | Tcl-Tk@ | TeX@ | Teachers Help@ |
| Team and League Management, Sports@ | Technical Writing@ | Telecommunications@ | Telephony, Internet@ | Telnet Clients@ | Telnet Servers@ |
| Tennis@ | Terminal Emulation@ | Terminal Services@ | Terragen@ | Terrain, 3D@ | Testing, Communications@ |
| Testing, Electronics@ | Testing, Psychological@ | Testing, Software@ | Textiles and Nonwovens@ | Themes, Desktop@ | ThreadX@ |
| Thunderbird@ | Time Clients@ | Time Servers@ | Time Tracking@ | TinyOS@ | Topology, Mathematical@ |
| Translation@ | Transportation, Maritime@ | Transportation and Logistics@ | Travel Industry@ | Travel Preparation@ | Trojan Horses@ |
| Trucking@ | Two-Way Radio Communications@ | Typesetting@ | Typing@ |
