| 10Micron | 756 | 18415 |
| 123apps.com | 2 | 2 |
| 2047STUDIO | 24 | 118 |
| 2Astro | 11 | 57 |
| 656 Imaging | 10 | 93 |
| 7artisans | 9 | 24 |
| ABM | 1 | 1 |
| Abrosoft | 3 | 22 |
| ABSoft, NeatLab | 19 | 104 |
| Acclaim Software Ltd | 0 | 0 |
| ACDSee | 13 | 473 |
| ACD Systems International Inc. | 7 | 1081 |
| Achim Schaller | 59 | 142 |
| Acroname | 1 | 3 |
| Acuter | 77 | 396 |
| ADM Accessories | 16 | 159 |
| AdmCNC | 3 | 40 |
| Adobe | 10392 | 219986 |
| Affinity | 488 | 4557 |
| Agena Astro | 44 | 657 |
| AG Optical | 156 | 2006 |
| AGPTEK | 2 | 14 |
| agriggio | 4 | 62 |
| Airspy | 1 | 1 |
| Airy Disk | 12 | 76 |
| Airylab | 12 | 2681 |
| Ai-Thinker | 1 | 1 |
| A.J. Qviller | 1 | 2 |
| AKASO | 1 | 1 |
| Alcor System | 69 | 799 |
| Aleksey Chernov | 5 | 24 |
| Alex Koksin | 1 | 2 |
| Allied Vision Technologies | 2 | 11 |
| AllSkEye | 9 | 17 |
| Alluna Optics | 14 | 48 |
| Alstar | 5 | 56 |
| ALT | 17 | 407 |
| Altair | 1035 | 12769 |
| Altair / Skytech | 39 | 203 |
| AMS | 0 | 0 |
| Anat Ruangrassamee | 1 | 2 |
| Andor | 7 | 157 |
| Andover Corporation | 1 | 8 |
| Andreas Rörig | 23 | 492 |
| Andrey Myznikov | 1 | 4 |
| Angeleyes | 71 | 639 |
| Anker | 8 | 27 |
| Anssen Technologies | 1 | 2 |
| Antares | 67 | 572 |
| Antila | 80 | 349 |