A partial listing of Corporations using ESS/400 Client/Server Products
| Company Name | Application | ESS Product |
| Acordia Personal Insurance | Insurance | Clipper |
| American Express Travel Services | Customer Service | Visual Basic |
| Avenor, Inc. | Canadian Forestry - Pulp & Paper Industry | Visual Basic |
| CitiCorp Financial Services | Banking Systems | FoxPro |
| Clopay Corporation | Manufacturing Applications | Access |
| Exide Electronics | Remote Order Entry | FoxPro |
| Frontier Information Technologies | Telephone Industry Applications | Visual Basic & C/C++ |
| Gannett Co., Inc | Various | FoxPro |
| Hotel Corobici Costa Rica | Point of Sales Applications | FoxPro |
| Hotel Cariari Costa Rica | Point of Sales Applications | FoxPro |
| IGF Insurance | Insurance Applications | FoxPro |
| Kuehne & Nagel of England | Transportation Applications | FoxPro |
| McKechnie Metals New Zealand | Manufacturing Applications | Visual Basic |
| Mediacom Canada | Various | FoxPro |
| Missouri Consolidated Health Care | Health Care | FoxPro |
| Missouri House of Representatives | House Floor Operations | Visual Basic |
| State of Missouri | Legislative Research | Visual Basic |
| Orvis | Various | Clipper |
| Pepsi-Cola | Various | Clipper |
| Saudi Investment Bank Saudi Arabia | Banking System | Visual Basic & FoxPro |
| Sony Broadcast Export Corporation | Various | FoxPro |
| Springs Industries | Manufacturing & Quality Control | Visual Basic |
| State of Nevada -Transportation | Various | FoxPro |