A version named Calmira Longhorn is not compatible with Windows Vista, but emulates some of the visual features of that operating system.

Because the Windows 3.x environment is virtually extinct as of 2009, additions of new features and addons to Calmira are few and far between.

The source code for the Calmira shell is publicly available under GNU GPL license, thus allowing software developers to participate in the project.

[1] Being open source, some people developed their own version of Calmira, adding other features and customizations.

Here is a list of the most used ones: Other versions and the original one can be found at Calmira Online.