Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
Redmine - Flexible project management web application
Travis CI - Focus on writing code. Let Travis CI take care of running your tests and deploying your apps.