I checked out Moodle, edX, OpenMOOC, Nekomy, and Sagefy, and it looks like Sagefy would be the easiest place to start if we don't want to start from scratch (my thought on starting from scratch with a small team is that it's a good way to risk never shipping anything). The code is decent, demo actually works, and it's not several years out of date, and it's Apache 2 licensed so there would be no problems with us forking it.
I checked out Moodle, edX, OpenMOOC, Nekomy, and Sagefy, and it looks like Sagefy would be the easiest place to start if we don't want to start from scratch (my thought on starting from scratch with a small team is that it's a good way to risk never shipping anything). The code is decent, demo actually works, and it's not several years out of date, and it's Apache 2 licensed so there would be no problems with us forking it.