Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
AskNicely - Collect customer experience feedback on a daily basis and empower your team to take immediate action to drive retention, upgrades, reviews and referrals.
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.
Delighted - The fastest and easiest way to gather actionable feedback from your customers
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Survicate - Collect feedback on your website and find out more about your visitors.