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GitLab is a on-premise or hosted Git repository management tool. It also includes code reviews, issue tracking, wikis, and continuous integration.

Trusted by 11,000+ businesses, JIRA is the leading bug tracking, issue tracking and project management tool. JIRA combines issue tracking, agile project management, customisable workflow, and a pluggable integration framework to increase the velocity of your software development team.

Kanboard is a simple visual task board software.

Phabricator is a collection of open source web applications that help software companies build better software.

Mantis Bug Tracker is a free and open source, web-based bug tracking system. It is written in the PHP scripting language and works with MySQL, MS SQL, and PostgreSQL databases and a webserver. MantisBT can be installed on Windows, Linux, Mac OS, OS/2, and others. Almost any web browser should be able to function as a client. Moreover MantisHub is available as commercial hosted solution of MantisBT.

Open source Trello-like kanban board. Based on Restya platform.

A Kanban-inspired app for keeping track of things that need to get done.

Team Clerk is project and task management software that automatically keeps your team organized and monitors progress of all of your projects and tasks. Let us organize what you do,so you can focus on why you do it.

Buckets is a simple & intuitive task organization, cloud-based app that allows professionals & non-professionals alike to collaborate

Stacks is an easy to use task manager that helps to organize your tasks in an elegant and intuitive way. Using kanban paradigm for managing your projects Stacks offers a flexible and visual way to organize your tasks with ease. Combining powerful features like tags, task grouping, quick search and attachments with a beautiful user interface, Stacks aims to make task management both easy and fun.

Allura is an open source implementation of a software "forge", a web site that manages source code repositories, bug reports, discussions, mailing lists, wiki pages, blogs and more for any number of individual projects. SourceForge.net is running an instance of Allura. It is extensible in several ways, most importantly via the notion of "tools", but also with themes, authentication, and various other pluggable APIs.