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.

AttendanceBot - Time & attendance tracking for distributed teams

Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.

Shiftee - Shiftee streamlines the process of employee scheduling, time clock attendance to payroll by providing a solution to manage and help business

Virtuagym - Virtuagym is a unique, all-in-one fitness solution tailor-made for fitness businesses of all sizes...

teamdeck - Teamdeck is a SaaS resource management tool with resource scheduling, leave management, time tracking and timesheet, and customizable reports features. Selected by Hill-Knowlton, Stormind Games, Wunderman Thompson. $3.60/per member.