| ID | Name | Type |
|---|---|---|
| #18520 | Almighty God | - |
| #767 | Alo Soft | Z |
| #19343 | Alois Svítil | + |
| #768 | Alone Coder | - |
| #769 | Alos | ? |
| #18678 | Aloysius Beltway | + |
| #770 | Alpha Computer Products | Z |
| #771 | Alpha Denshi | ? |
| #772 | Alpha Software | M |
| #773 | Alpha Systems | Z |
| #774 | Alpha ZX81 Software | Z |
| #775 | Alpha-Omega Software | Z |
| #776 | AlphaPlus Educational Software | Z |
| #777 | Alphabatim | Z |
| #778 | Alphasoft | S |
| #779 | Alphoid | ? |
| #21784 | Alt om Data | B |
| #780 | Altair Software | Z |
| #781 | Alter World | ? |
| #782 | Alternative Software Ltd | P |