| tom4mac IT-Consulting KG | Salzburg |
| toolani GmbH | Vienna |
| ToolSense | |
| Top Versicherungs-Vermittler Service GmbH | |
| Top-jobs-europe.at | Vienna |
| TOWA GmbH | Vienna |
| TP-media | Vienna |
| Tractive | Upper Austria |
| Traktionssysteme Austria GmbH | |
| Trality | |
| transForm | Vienna |
| Transpaygo | |
| Transporter | |
| treAngeli | Lower Austria |
| Trending Topics | Vienna |
| Trenkwalder Group AG | |
| TREVISION Groß.Bild.Technik GmbH | Burgenland |
| Tributech Solutions GmbH | |
| Tricentis GmbH | Vienna |
| Trigo GmbH | |
| TriLite Technologies GmbH | |
| trinitec IT Solutions & Consulting GmbH | |
| TRIOTRONIK Computer und Netzwerktechnik GmbH | Styria |
| Triply GmbH | |
| Tripmakery GmbH | |
| trisign e.U. | |
| TriSys | Vienna |
| troii Software GmbH | Upper Austria |
| Truendo Technologies GmbH | |
| Trustbit | |
| TTI Personaldienstleistung GmbH & Co. KG | |
| TTTech Auto | |
| TTTech Computertechnik AG | Vienna |
| TTTECH Computertechnik AG | |
| TTTech Industrial Automation AG | |
| TU Graz - Institute of Machine Learning and Neural Computation | Styria |
| TU Wien - Algorithms and Complexity Group | Vienna |
| TU Wien Informatics | Vienna |
| TU Wien Informatics - Software Engineering | Vienna |
| tubics GmbH | |
| Turn360.com | Salzburg |
| TÜV Austria Holding AG | Lower Austria |
| TÜV TRUST IT GmbH | |
| twinformatics GmbH | |
| twingz development GmbH | |
| Txture | |
| TYPO3Kurse | Lower Austria |
| TYPOHEADS GmbH | Vienna |
| Ubiq GmbH | |
| UCS - unique computing solutions GmbH | Vienna |