We've open-sourced several other mostly-KA-specific parts of the site, including these: https://github.com/Khan/khan-exercises https://github.com/Khan/khan-exe

We've open-sourced several other mostly-KA-specific parts of the site, including these: https://github.com/Khan/khan-exercises https://github.com/Khan/khan-exercises https://github.com/Khan/perseus https://github.com/Khan/perseus https://github.com/Khan/live-editor https://github.com/Khan/live-editor Contributions are few and far between; good contributions are even more so. It hasn't been worth the time investment, unfortunately.