Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Rainmaker - Rainmaker allows you to make your Google Contacts better.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
dip - accountability groups for developers