- https://github.com/share/sharedb (by an engineer that worked on Google Docs OT)
- https://github.com/google/ot-crdt-papers
- https://www.codox.io/
- https://github.com/automerge/automerge
- https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type
- https://en.wikipedia.org/wiki/Operational_transformation
- https://en.wikipedia.org/wiki/Vector_clock
- https://www.youtube.com/watch?v=yCcWpzY8dIA (by Kleppmann)
- https://www3.ntu.edu.sg/home/czsun/projects/otfaq/ (by an author of COT)