Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
ResistBot - Civic engagement application.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Countable 3.0 for iOS - Understand legislation in Congress and contact lawmakers
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Democracy.io by EFF - A simpler way to send messages to Congress