Thanks to Rickta59 and Gordon, I have now added C++ support on Inventortown. It’s an experimental feature. Procedure:
1. Create a fresh project, select CPP as language
2. When adding files, use .cpp (lower case) as the file name extension
3. Compile as normal (not well tested yet)
Note that you can change language (Makefiles) on the Project Settings page.
See this thread for some C++ info.
We got a baby boy yesterday. So for a while my focus will probably be elsewhere and I won’t be able to do as many projects as normal. I’ll be back… with many more ideas 
I’ve now added support for cloning a github project into your Inventortown project. Basically:
1. Create a new empty project on Inventortown.
2. Click the ‘git clone’ on the left
3. Enter the readonly address for the github project you want to clone. For example git://github.com/mobilars/LarsRF-mspgcc.git
4. If your project had multiple main-files, you have to delete the ones you don’t want (the example has several files with main in them).
5. If your project had a directory structure, you may have to change the relative include files. The above function copies ALL the .h and .c files into a single directory, so you have to change files because of this.
6. Click compile…
It’s a very untested function. Please report if it works or not for you, and give feedback to how you’d like the function improved.
Adam at Inventortown came up with something quite cool. He copied Bob Somers’ code which can play music and compiled it using Inventortown’s online compiler.
UPDATE: I couldn’t get that project to compile properly after the compiler has been updated, as it was for the old MSPGCC. Bob Somers has updated his code for the new compiler. So I got it from his Github again and made a new project which is here.
And a video of it playing. (After programming with the Inventortown uploader, you need to unplug the board and plug it in again for it to work).