Depends on when you worked for them. Any of these sound familiar:
DREAMS, Passport, Siebel, SBC, Opera, Travelbox, Wishes, DSBC, HRGAS, DPMS, LMS
Unsolicited advice: If you need to ask what the software was that you were using, then it's probably long enough ago that it's not adding anything to your resume. Or worse, an interviewer will see it and ask you questions about it, which you'll then stumble your way through answering.