Now it is you who defines what to implement in the next major version of GanttProject. There is a features voting page on our community site where everyone can vote for one or more from the list of 12 features. The only thing you have to do to be able to vote is to register at community site and fill a short survey. Having that done, you may spend 3 votes on the features you like. Please read the rules of voting carefully and don't forget to login to GanttHive with your account name

Yes, you can. You can if you contribute to GanttProject. Your contribution may be a bug report, a translation or just a money donation. Please read the details of our contribution system.