Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Workday - Workday is an on‑demand financial management and human capital management software solution.

Nifty - Manage projects, work, and communications in one place.

Paylocity - Paylocity has revolutionized the industry and has quickly become the leading independent provider of online payroll services and HR solutions.

CAMPR - Open source project management tool with 16 modules

Paycom - Paycom is a Human Capital Management system that helps companies manage the complete employment life cycle, from recruitment to retirement.