| Business | Phone |
| Infodyne Corp 1460 Renaissance Dr 308, Park Ridge 60068 | (847) 759-1000 |
| Ironbridge Software Inc 1460 Renaissance Dr 200, Park Ridge 60068 | (847) 699-3369 |
| Safari Systems Inc 524 Busse Hwy, Park Ridge 60068 | (847) 692-3545 |
| Purple Oak Inc 1420 Renaissance Dr 215, Park Ridge 60068 | (847) 699-9630 |
| Zethcon Corp 512 Higgins Rd, Park Ridge 60068 | (847) 318-0800 |