| 10Micron | 681 | 15966 |
| 123apps.com | 1 | 1 |
| 2047STUDIO | 26 | 103 |
| 2Astro | 11 | 49 |
| 656 Imaging | 10 | 92 |
| ABM | 1 | 1 |
| Abrosoft | 3 | 19 |
| ABSoft, NeatLab | 18 | 87 |
| Acclaim Software Ltd | 0 | 0 |
| ACDSee | 12 | 334 |
| ACD Systems International Inc. | 7 | 961 |
| Achim Schaller | 57 | 136 |
| Acroname | 1 | 3 |
| Acuter | 42 | 253 |
| ADM Accessories | 16 | 139 |
| AdmCNC | 2 | 37 |
| Adobe | 9877 | 199983 |
| Affinity | 320 | 2601 |
| Agena Astro | 41 | 578 |
| AG Optical | 151 | 1721 |
| AGPTEK | 3 | 14 |
| agriggio | 4 | 61 |
| Airy Disk | 11 | 59 |
| Airylab | 12 | 2450 |
| A.J. Qviller | 1 | 2 |
| AKASO | 1 | 1 |
| Alcor System | 67 | 793 |
| Aleksey Chernov | 5 | 22 |
| Alex Koksin | 1 | 2 |
| Allied Vision Technologies | 2 | 3 |
| AllSkEye | 8 | 17 |
| Alluna Optics | 14 | 40 |
| Alstar | 4 | 31 |
| ALT | 16 | 303 |
| Altair | 948 | 11443 |
| Altair / Skytech | 36 | 177 |
| AMS | 0 | 0 |
| Anat Ruangrassamee | 1 | 2 |
| Andor | 7 | 156 |
| Andover Corporation | 1 | 8 |
| Andreas Rörig | 24 | 492 |
| Andrey Myznikov | 1 | 4 |
| Angeleyes | 63 | 530 |
| Anker | 8 | 18 |
| Anssen Technologies | 1 | 1 |
| Antares | 58 | 515 |
| Antila | 84 | 362 |
| Antlia | 2938 | 32014 |
| Antti Kuntsi | 11 | 202 |
| AnyDesk Software GmbH | 2 | 4 |