If more than one person is working on a task or project it can get a little tricky to organise who is doing what and in what order.

Planner is an open source equivalent of software such as Microsoft Project.

Different tasks can be assigned to the people involved in the project along with information of the order they must be completed in. This can then be used to create Gantt charts for estimating the amount of time needed to finish the project.

This program requires the GTK 2.6 software in order to work. If you are using the GIMP image editing software it will already be installed, otherwise you can download it here.