Zombie Loyalists - Using Great Service to Create Rabid Fans
Google Open Source - All of Googles open source projects under a single umbrella
ChatWhale - Gamify your customer communication and loyalty rewards
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Open Loyalty for Startups - Open source stack for building customer focused products
Open Source @IFTTT - A collection of IFTTT OSS projects.