| Business | Phone |
| Rolfe & Nolan Systems Inc 120 S Riverside Plz, Chicago 60606 | (312) 559-0257 |
| Ibm Lotus Software 330 N Wabash Ave 300, Chicago 60611 | (312) 245-6425 |
| Q 3 Telecom 8700 W Bryn Mawr Ave, Chicago 60631 | (773) 714-5010 |
| Pegasystems Inc 70 W Madison St, Chicago 60602 | (312) 214-7227 |
| Tibco Software Inc 125 S Wacker Dr, Chicago 60606 | (312) 214-6900 |