Luupro - Get social about the projects you're working on!
Ship - Fast, native issue tracking for software projects
Waitlist API - Quick and easy waitlist with built in referral.
Should I Make This? - Share ideas and get feedback and followers 💭👣
Landing Pages in MailChimp - Easy to build, custom landing pages for free
Pushfolio - Send popup messages with a few lines of Javascript for free.