UnderPinned - One app to manage your projects from start to finish.
Nifty - Manage projects, work, and communications in one place.
The Freelancer Toolkit - A collection of essential tools and services for freelancers
Freelancer Tools - Best hand-picked tools for freelancers
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.
Freelancer Stack - Curated directory of tools used by 10,000+ freelancers