Teamwork is a project and task management platform built specifically for client-facing teams — agencies, consultancies, and professional services firms — with features like client user accounts, budget tracking, billable time, and workload management built in from day one. Founded in Cork, Ireland in 2007, Teamwork is used by over 20,000 businesses. Its Milestones feature tracks key project deliverables, while its resource scheduling prevents the over-assignment that commonly derails agency project delivery at scale.

Reference:

Teamwork on Wikipedia

https://en.wikipedia.org/wiki/Teamwork_(software)