| Business | Phone |
| 4 D's Ltd Software & Consltng 4351 Vineyard Ln, Muskegon 49441 | (231) 798-3366 |
| Sigma Software Corp Muskegon 49441 | (231) 780-4604 |
| Chambers Software Svc 427 Seminole Rd, Muskegon 49444 | (231) 733-1963 |
| Infoview Systems Inc 1831 Lakeshore Dr, Muskegon 49441 | (231) 759-1103 |