| Company Name | Software Titles |
|---|---|
| Audio Conversion Wizard | 1 |
| Audicon | 1 |
| Audible | 2 |
| Audatex, a Solera company | 1 |
| Audacity version | 1 |
| Audacity Team | 1 |
| Audacity | 1 |
| Auctionpay | 1 |
| Auction Systems | 1 |
| Auburn University | 2 |
| ATX Software | 1 |
| ATUS AG | 1 |
| Attus Technologies | 1 |
| Attunity | 1 |
| Attrice | 2 |
| Attractel | 1 |
| Attorneys' Computer Network | 1 |
| ATTO Technology | 1 |
| Attila Keszi | 1 |
| Attensa | 1 |
| Attask | 2 |
| Attansic | 2 |
| Attainment Company | 2 |
| AttachmateWRQ | 2 |
| Attachmate | 14 |
| ATT | 15 |
| AtStaff | 1 |
| atPurpose | 1 |
| ATP | 1 |
| AtomPark Software | 3 |
| Atomix Productions | 1 |
| Atola Technology | 2 |
| ATO | 1 |
| Atmel | 9 |
| Atlassian | 1 |
| Atlas | 9 |
| Atlantic Records | 1 |
| Atlantic Link | 2 |
| ATK | 5 |
| Ativa | 2 |
| ATI Technologeis | 2 |
| ATI Research | 3 |
| ATI | 113 |
| Athletic Rules Study | 1 |
| Atheros | 32 |
| Athena Smartcard Solutions | 4 |
| Aternity ltd. | 1 |
| ATEN | 3 |
| Atempo | 1 |
| atebits | 1 |