| Business | Phone |
| Cater Sys Software 409 Bridlewreath Way, Mt Airy 21771 | (301) 670-8348 |
| Ktl Applied Sciences Inc 6419 Homebuilder Dr, Mt Airy 21771 | (301) 829-2675 |
| Lone Star Software 509 E Ridgeville Blvd, Mt Airy 21771 | (301) 829-1622 |
| Quality Systems & Support Inc 6520 Ringdancer Dr, Mt Airy 21771 | (410) 549-0879 |
| Venturecom Inc 106 E Ridgeville Blvd, Mt Airy 21771 | (301) 829-8580 |