| Business | Phone |
| Ventana Systems Inc 60 Jacob Gates Rd, Harvard 1451 | (978) 456-3069 |
| Systems Plus 32 Prospect Hill Rd, Harvard 1451 | (978) 456-2333 |
| Cybertools 249 Ayer Rd, Harvard 1451 | (978) 772-9200 |
| Harvard Thermal Inc 249 Ayer Rd # 102, Harvard 1451 | (978) 772-3800 |
| Eze Castle Software 116 Ayer Rd, Harvard 1451 | (978) 456-7973 |