DRoster Employee Scheduler uses Firebird

DRoster 2.2.1 provides businesses and organizations of all sizes and needs with the flexibility required to create unique schedules, rosters, and shifts. Driven by a rule-based engine, DRoster validates schedules and availability times instantly preventing costly and time-consuming clashes and errors in scheduling. It uses a standard Software industry database (Firebird) to enable integration of DRoster with other data sources and applications. More information here.