Name: Scene Builder
Why to include: I need it for school :)
Is it open source?: According to the github, it is: "Scene Builder is open source, and it is freely licensed under the BSD license. Gluon can provide custom consultancy and training, and open source commercial support."
Tarball: There is no tarball. There is only a github page. I tried installing it from there and I get a build fail. There are rpm and deb packages on the project's download page which I have linked above.
Here is the link to the GitHub: