| Company Name | Software Titles |
|---|---|
| Zenith Technology Limited | 1 |
| ZenJu | 1 |
| Zenographics | 1 |
| Zenturi | 1 |
| Zenwerx Custom Programming | 1 |
| Zeon | 1 |
| Zephyr | 1 |
| ZeraWare | 1 |
| Zero-Knowledge Systems | 1 |
| ZeroSPAM | 1 |
| Zevez | 1 |
| Zhengpeng Hou | 1 |
| ZhiQing Soft | 1 |
| Zidsoft | 1 |
| Ziff-Davis Media | 7 |
| ZillaTube | 1 |
| ZIM | 1 |
| Zimbra | 3 |
| Zinio | 4 |
| Zion Software | 1 |
| Zipclix | 1 |
| ZipGenius | 1 |
| Zittware | 1 |
| ZiWu-Soft EDV Systeme GmbH | 1 |
| ZixCorp | 5 |