| Titanium Software | |
| Tixeo | Hérault |
| TKS Informatique | Oise |
| TKT | |
| TLTI | Paris |
| TMIC Ellipses | Haute-Garonne |
| TMM Communication | Yvelines |
| TMPI | Haute-Garonne |
| TNE.fr | Ain |
| To be online | Hauts-de-Seine |
| TOBAM | |
| Tohtem Maker | |
| Toile de fond | Orne |
| Toile Libre | Paris |
| Tolède | Aube |
| Tollys | |
| TOLV | |
| Tomcat | |
| TONNA Électronique | Marne |
| TonyVista Informatique | Morbihan |
| Tooap | |
| Tooeasy | |
| Toolee S.A.S. | |
| Toolip | |
| Toornament S.A.S. | |
| TooSmart | |
| Top Achat | Seine-Saint-Denis |
| TOP10 Stratégie | Métropole de Lyon |
| Topaze | Alpes-Maritimes |
| Topbiz.fr | Landes |
| Topizy | |
| Topo Lab | |
| Topo.io | |
| Toporder | |
| TopSolid | Essonne |
| Topsys | Paris |
| Topwize | Hérault |
| Torken | Paris |
| Torop.Net | Haute-Saône |
| Tortoise | |
| TotalEnergies On | |
| TotaLinux | |
| Totus Solutions | |
| Touaregs | Paris |
| Touch Sensity | |
| Toulouse Biotech Institute | |
| Toulouse Perl Mongers | Haute-Garonne |
| Toulouse School of Economics | |
| Toulouse Space Show | Haute-Garonne |
| Toulouse White Biotechnology | |