The Khaled bin Sultan Living Oceans Foundation has a great website that features scientific data and educational tools. They have also produced detailed maps for many of the never-before-seen reefs we had the good fortune to dive during the "Global Reef Expedition." They are in the process of adding more and more data layers to these maps at this site: maps.lof.org/lof/.
Basic coral reef knowledge
For educational tools on marine biology, with a focus on coral reefs, go here.
Thriving Corals: basic coral reef ecology
UQ edX course (WWF) on coral reef ecology
EnviroTech: for-profit courses on marine conservation and restoration for Australians
Restoration and advanced topics
The Reef Resilience Network has also been creating some instructional videos on coral reef restoration
.