Freelancer Stack - Curated directory of tools used by 10,000+ freelancers
Nifty - Manage projects, work, and communications in one place.
The Freelancer Toolkit - A collection of essential tools and services 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.
PlanArty - Time management solution dedicated to freelancers and small business owners
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.