| 10Micron | 676 | 15640 |
| 123apps.com | 1 | 1 |
| © 1995-2011 Fredrik Lundh and contributors. © 2010-2024 Jeffrey A. Clark and contributors. | 1 | 0 |
| 2047STUDIO | 26 | 103 |
| 2Astro | 10 | 47 |
| 2EL | 0 | 0 |
| 3d printed | 2 | 21 |
| 4tronics | 2 | 19 |
| 50EDPH 0.84x Reducer | 0 | 0 |
| 656 Imaging | 10 | 92 |
| 656 Imaging AD300 12in Dall-Kirkham F6.8 | 0 | 0 |
| 7artisans | 7 | 13 |
| ABM | 1 | 1 |
| Abrosoft | 3 | 19 |
| ABSoft, NeatLab | 18 | 77 |
| Acclaim Software Ltd | 0 | 0 |
| ACDSee | 12 | 320 |
| ACD Systems International Inc. | 7 | 929 |
| Achim Schaller | 55 | 134 |
| ACP Scheduler | 0 | 0 |
| Acroname | 1 | 1 |
| Acuter | 41 | 246 |
| Acuter Elite Phoenix 40/400 | 0 | 0 |
| ADM Accessories | 16 | 137 |
| AdmCNC | 2 | 36 |
| Adobe | 9782 | 196675 |
| Affinity | 297 | 2322 |
| Agema Optics Inc. | 1 | 5 |
| Agena Astro | 40 | 564 |
| AG Optical | 150 | 1699 |
| AGPTEK | 3 | 14 |
| agriggio | 4 | 61 |
| Airspy | 0 | 0 |
| Airy Disk | 9 | 57 |
| Airylab | 12 | 2441 |
| A.J. Qviller | 1 | 1 |
| AKASO | 1 | 1 |
| Alcor System | 67 | 790 |
| Aleksey Chernov | 5 | 17 |
| Alex Koksin | 1 | 1 |
| Allied Vision Technologies | 1 | 2 |
| AllPowers | 1 | 12 |
| AllSkEye | 8 | 17 |
| Allsky | 0 | 0 |
| Alluna Optics | 14 | 39 |
| Alluxa | 2 | 2 |
| Alstar | 4 | 31 |
| ALT | 16 | 297 |
| Altair | 930 | 11150 |
| Altair / Skytech | 36 | 176 |