Yubikey plugin (yubikey_rc) for Roundcube-0.3.1
The Yubikey plugin for RoundCube hosted on SourceForge (link is here) doesn’t work with RoundCube 0.3.1, so I patched it for new version.
I still don’t know if it works also with RoundCube 0.4 beta, eventually a new version will be released.
Link to yubikey_rc-0.2