The great Calendar and Tasklist plugins from Kolab always contained additional drivers, so they could be used out of a Kolab setup (using SQL database as a storage). That part was never a priority for Kolab developers, but with Roundcube 1.4 and Elastic skin these plugins will be again available from plugins.roundcube.net in an up-to-date versions.
Having Roundcube 1.4.0 on horizon I worked on fixing most important bugs related to the sql driver in these plugins. I also updated plugin mirrors to most recent version. From now on, I’ll try to keep them up-to-date (synchronize whenever a new version is tagged in the Kolab repository).
In comparison with the older version known to Roundcube users, the new version requires libkolab plugin (when using composer it will be installed automatically). It does not support the old Classic skin, but it has a full support for Larry and Elastic.
As before any code contributions, bug and feature requests should go to git.kolab.org.
Did I mention it works with the Elastic skin? It means that you can have your calendar and tasks on a mobile device.
ps. To install that new version with composer you have to wait for the official release of Roundcube 1.4.0.