| ID | Name | Type |
|---|---|---|
| #16548 | Apenao | + |
| #1205 | Aperks | ? |
| #1206 | Apina | ? |
| #1207 | Apocalipsis | ? |
| #1208 | Apocalypse Software | P |
| #1209 | Apogee Games [London] | Z |
| #1210 | Apogee Games [Wallington] | Z |
| #19268 | Aposoft | P |
| #20493 | AppSir Games | P |
| #1211 | Appleby Structured Systems | Z |
| #1212 | Appledean Systems | Z |
| #1213 | Applications Software Specialities | Z |
| #1214 | Applied Programming Techniques | Z |
| #1215 | Applied Systems Knowledge Ltd | P |
| #17045 | Applied Technology | H |
| #1216 | April Fool | ? |
| #1217 | Aprisobal | ? |
| #18312 | Apropos Technology | P |
| #1218 | Aqua Soft | Z |
| #22720 | Aquanauts Holiday | P |