Jennifer Valley: Free (or Cheaper) Tool and Resources for eLearning (February 2015)
Inexpensive or free tools and resources for animation, audio, graphics, course development, and more
The Top 8 Free/Open Source LMSs - Capterra Blog
This is actually 18+ free and/or open source LMSs. Some are truly open source, some are freemium or other business models. If you want a list that goes well beyond Moodle and Canvas, this is a good place to start.