I'm studying Project Management, right now. In that spirit of thoughts I and a couple of other guys are building a Project Plan.
As it Project Plan it's necessary to put a GANTT Chart in it to show visually the project timeline (the phases), the duration and the inter-relation between the different tasks which leads the project to an actual completion.
After a bit of thorough research online on available software to deal with project management and particularly, ones that are capable to build a GANTT charts on Linux / BSD.
I've come with the following list of software capable to be a substitute for the Microsoft Project software.
Redmine GANTT Chart
1. Gantt Project
GANTTProject Chart
2. Gnome Planner
Planner GANTT Chone Chart
3. Task Juggler Project Manager with GANTT Capability for (KDE)
Task Juggler
4. JxProject – This software is not free, though it can be considered almost free
Take a look also at:
5. Trac , though it doesn't really support GANTT charts it's a lovely software to be used for PM.
Another option you have is to try out:
6. PHProjekt
Update 20.09.2016 – PHPProject Old download link is no longer active
It is this link http://www.phprojekt.com/, but the page doesn’t seem to be active any more. I thought you might want to update.
If you are looking for an alternative please check out http://wiht.link/PHProjekt-PM, it may make a suitable replacement.
Kind Regards,
Tom Wilcox
That piece of softwre really looks promising, especially if we consider that it's web based and how much essential is today to have an anline tools for doing the ordinary desktop jobs.
You can even check an online demo of the PHPProjekt software here
If you're a type of KDE user you definitely has to try out Kplato
As I've tested the software the software is easy to be used, however it still is missing some essential parts that Microsoft Project includes so it's not 100% substitute.
Also it's not able to open Microsoft Project (MPP) files, neither able to save the charts in the .mpp format.
Moving ahead I've came across DotProject 
DottProject Gantt Chart
I haven't took the time to test it myself but however, as I go through the software website the project looked quite good.
Lastly you can take a look at: 7. PStricks as a mean of project management, however I think it doesn't support GANTT chart building.
>
