Luupro - Get social about the projects you're working on!
Idea Hunt - Solve specific challenges for your favorite products
Waitlist API - Quick and easy waitlist with built in referral.
Idealist - Volunteer, work, and intern job search
Landing Pages in MailChimp - Easy to build, custom landing pages for free
OpenVC - 2200+ VC firms by thesis to find 'best fit' for your startup