| 10Micron | 742 | 17925 |
| 123apps.com | 2 | 1 |
| 2047STUDIO | 27 | 117 |
| 2Astro | 11 | 57 |
| 656 Imaging | 10 | 92 |
| 7artisans | 8 | 23 |
| ABM | 1 | 1 |
| Abrosoft | 3 | 21 |
| ABSoft, NeatLab | 19 | 97 |
| Acclaim Software Ltd | 0 | 0 |
| ACDSee | 12 | 452 |
| ACD Systems International Inc. | 7 | 1058 |
| Achim Schaller | 58 | 141 |
| Acroname | 1 | 3 |
| Acuter | 62 | 315 |
| ADM Accessories | 16 | 154 |
| AdmCNC | 3 | 40 |
| Adobe | 10231 | 214631 |
| Affinity | 451 | 4101 |
| Agena Astro | 43 | 646 |
| AG Optical | 155 | 1948 |
| AGPTEK | 3 | 14 |
| agriggio | 4 | 62 |
| Airspy | 0 | 0 |
| Airy Disk | 12 | 71 |
| Airylab | 12 | 2646 |
| Ai-Thinker | 0 | 0 |
| A.J. Qviller | 1 | 2 |
| AKASO | 1 | 1 |
| Alcor System | 69 | 785 |
| Aleksey Chernov | 5 | 23 |
| Alex Koksin | 1 | 2 |
| Allied Vision Technologies | 2 | 10 |
| AllSkEye | 8 | 17 |
| Alluna Optics | 14 | 47 |
| Alstar | 4 | 35 |
| ALT | 17 | 385 |
| Altair | 1003 | 12420 |
| Altair / Skytech | 38 | 197 |
| AMS | 0 | 0 |
| Anat Ruangrassamee | 1 | 2 |
| Andor | 8 | 157 |
| Andover Corporation | 1 | 8 |
| Andreas Rörig | 24 | 492 |
| Andrey Myznikov | 1 | 4 |
| Angeleyes | 67 | 613 |
| Anker | 9 | 25 |
| Anssen Technologies | 1 | 1 |
| Antares | 65 | 558 |
| Antila | 76 | 323 |