PlayHex.org is a web application to play Hex online.
Features are:
- play against players, blitz, live or correspondence
- play against bots, at different levels
- request an AI analysis to spot your blunders
- ranked games and rating history
and other features like conditional moves, custom board size and game options, games archive, your account stats, in-game chat…
And here is some more links:
Contribute – Contributors – Compute AI moves – AGPL-3.0 license