It has become apparent that some people who would like to contribute to the project are unable to do so, as they do not know what needs to be done. Short answer: Everything!
Seriously. The project is still in its early stages, and any contributions are welcome. A guide to contributing is located at our wiki, specifically here. Hopefully all the necessary information is there. Comment below if you feel something is missing.
Also set up recently was a 'Google Group'. You should be able to use this to discuss things and future content etc. (Although what you'd actually usefully discuss is somewhat unknown at this time)
Oh, we also have a FaceBook page. It's, umm, quiet.
In FreeRCT development news, preliminary work is being done to add the first Roller Coasters!
Any other questions, leave a comment below!