Reference

Information-oriented. File formats, API, data model, vocabularies.

For contributors
API reference

Three surfaces, one implementation — the REST core, the /ff/ client surface, and the deprecated XML-RPC adapter.
For researchers
File formats

What .mfpx is, what you get in .json, and which format to ask for.
For newcomers
Glossary

The vocabulary this site uses, in the sense it uses it.
For researchers
Python client

The mofplus package — what each class talks to, and what still works unchanged.