This post summarizes applications for project management that are free/libre and open-source software (FLOSS).
List of FLOSS Apps for Project Management
Some free/libre and open-source software (FLOSS) applications for project management:
Open-source. Written in Ruby.
OpenProject Community Edition is the FLOSS version of OpenProject.
Proprietary Project Management Apps
Among the non-free, there is other software like Microsoft Project or Agilefant.