Freelancer Stack - Curated directory of tools used by 10,000+ freelancers
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
Freelance Rate Explorer - Visualize rates for thousands of freelance designers & devs
SavvyCal - A scheduling tool both the sender and the recipient will love.
Freelancer Resources List - The biggest collection of free resources for freelancers
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.