| PC/MS-Windows pack. |  001 Game Creator Model 347400 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | 2D To 3D Model Editor Model 1201140 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 2D Vtuber Cutiecats Model 1219140 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D Controller Overlay Model 1951950 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D Organon Anatomy - Enterprise Edition Model 1099550 | 2019 | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D Organon Anatomy 2018 Model 583620 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D Organon VR Anatomy - Enterprise Edition Model 1081730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D ParticleGen Visual FX Model 279740 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3D Sprite Renderer and Convex Hull Editor Model 468900 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DCoat Modding Tool Model 776920 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DF Zephyr - Free Steam Edition Model 628220 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DF Zephyr - Lite Steam Edition Model 438450 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DMark 11 Model 205270 | 2012 | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DMark Vantage Advanced Model 205252 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DMark Vantage Model 205250 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DMark Model 223850 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3DMark11 Advanced Model 205272 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3dRudder Driver for SteamVR Model 1264470 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3tene Model 871170 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | 3ZENTREE - 3D Node based information system Model 1282440 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aartform Curvy 3D 3.0 Model 253670 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aartform Curvy 3D 4.0 Model 1105450 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Aartform Curvy 3D 5 Model 2386980 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ABC Paint Model 907520 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Abelana's Atom Maker Model 1180560 | 2020 | Steam Valve Corp. |
| PC/MS-Windows pack. | ACDSee 15 Model 220960 | 2012 | Steam Valve Corp. |
| PC/MS-Windows pack. | ACID Music Studio 10 - Steam Powered Model 278190 | 2015 | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Supercross - Workshop Manager Model 1340510 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Against - Beatmap Editor Model 1853600 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | AGE Model 848340 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | AgfPro 3.0 Model 253370 | 2013 | Steam Valve Corp. |
| PC/MS-Windows pack. | AI CG Generation Engine Model 1881520 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ai-ON - Translator Application Model 1146720 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Aimersoft Imusic Model 1073420 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Alternate Universe Playbook Model 1763900 | 2023 | Steam Valve Corp. |
| PC/MS-Windows pack. | AM Model Viewer Model 506750 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Animation Sketchpad Model 1724880 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Animaze Model 1364390 | 2021 | Steam Valve Corp. |
| PC/MS-Windows pack. | Anytime Organizer 15 Model 377000 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Anytime Organizer Deluxe 16 Model 878880 | 2018 | Steam Valve Corp. |
