Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface. Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.
Flumotion is a streaming media server created with the backing of Fluendo. It features intuitive graphical administration tools, making the task of setting up and manipulating audio and video streams easy for even novice system administrators. Flumotion is released under the GPL.
This application supports the core Python 2.5 language, with no module imports or file I/O. It's meant to be used as a platform for creating programming tutorials, not for actually running or debugging production code.
K. Rivers, E. Harpstead, and K. Koedinger. Proceedings of the 2016 ACM Conference on International Computing Education Research, page 143--151. New York, NY, USA, ACM, (2016)