Upwork - Forget the old rules. You can have the best people. Right now. Right here.
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.com - Search for jobs related to Www freelancer com homepage or hire on the world's largest freelancing marketplace with 12m+ jobs. It's free to sign up and bid on jobs.
Notion - All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
Fiverr - One marketplace, millions of professional services.
Slack - A messaging app for teams who see through the Earth!