ProjectLibre version 1.6.2 has been released (2016/09/07). This is project management software with support for Gantt diagrams, which requires Java 1.6.

ProjectLibre is an open source java project management software. It gives you an easy way to create Gantt Diagrams just like Microsoft Project.
It runs with the following command "java -jar projectlibre.jar"
It requires OpenJDK 1.6.
Project URL: http://www.projectlibre.org/