MariaDB - An enhanced, drop-in replacement for MySQL
Workday - Workday is an on‑demand financial management and human capital management software solution.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Paylocity - Paylocity has revolutionized the industry and has quickly become the leading independent provider of online payroll services and HR solutions.
MySQL - The world's most popular open source database
Paycom - Paycom is a Human Capital Management system that helps companies manage the complete employment life cycle, from recruitment to retirement.