| Business | Phone |
| Kenda Systems 6303 Ivy Ln, Greenbelt 20770 | (301) 220-0180 |
| Mansai Corp 8001 Craddock Rd, Greenbelt 20770 | (301) 552-5372 |
| Mind's Eye Development 6918 Hanover Pkwy, Greenbelt 20770 | (301) 441-3800 |
| Savant Development Corp Greenbelt 20770 | (301) 982-9799 |
| Applied Information Sciences 7501 Greenway Center Dr # 6, Greenbelt 20770 | (301) 474-8357 |
| Atlantic Systems & Technology 7901 Greenbury Dr, Greenbelt 20770 | (301) 552-4434 |
| Casewide 7701 Greenbelt Rd, Greenbelt 20770 | (301) 614-3388 |
| Sylvest Management Systems 6411 Ivy Ln, Greenbelt 20770 | (301) 294-6877 |
| Talarian Corp 6404 Ivy Ln, Greenbelt 20770 | (301) 982-4000 |
| Titan Systems Averstar Group 6301 Ivy Ln # 200, Greenbelt 20770 | (301) 982-5414 |
| Comso Inc 6303 Ivy Ln # 300, Greenbelt 20770 | (301) 345-0046 |
| Datasource 7500 Greenway Center Dr, Greenbelt 20770 | (301) 441-2357 |
| Dynamix Corp 9111 Edmonston Rd # 100, Greenbelt 20770 | (301) 772-0101 |
| Grouped For World-Wide Chr Greenbelt 20770 | (301) 486-1449 |
| Hammers Co 7474 Greenway Center Dr # 710, Greenbelt 20770 | (301) 345-5300 |