Wikipedia
ProjectLibre
ProjectLibre is a project management software system. It intends to be a complete desktop replacement for Microsoft Project. ProjectLibre runs on the Java Platform, allowing it to run on the Linux, Mac OS or MS Windows operating systems. It is released under the Common Public Attribution License (CPAL) and thus qualifies as Free Software according to the Free Software Foundation.
ProjectLibre's initial release was in August 2012. It was voted as the open source Project of the Month for February 2016 by the SourceForge community.