IntouchApp - Universal contacts manager for mobile.
Freelancer Stack - Curated directory of tools used by 10,000+ freelancers
ContactRescue - Magically get your address book up-to-date and accurate
Side Hustle Stack - A resource to find platform-based work
Amplemarket Midas - Enriched contact information for your lists of emails
The Freelancer's Journey - Learn how to grow your freelance career in web design