View the current orderbook.
reddit, github, the README for getting started (includes link of youtube video of how to install and run), chat with us on IRC freenode #joinmarket, or cyberguerrilla same channel (bridged).
New joinmarket codebase now fully supports both Makers and Takers, uses segwit-based wallets for lower fees, and has some extra features, including basic support for PayJoin; start at the README and see some documentation in docs directory. There is a version of Joinmarket-Qt app.Blog of Adam Gibson (maintainer of site, Joinmarket contributor).
Ongoing discussion of a likely future protocol update here; we are looking for a good way to make economical Sybilling ineffective. There are some promising directions. Please get involved!
Another interesting project is for Coinswap instead of Coinjoin, see here.