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.
TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.
Redmine - Flexible project management web application
Pintask - Pintask is the most customizable Kanban board.
Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
buckets.co - Feature rich kanban board collaboration platform.