The 2.2.0 release of cadnano introduces a new plugin framework to facilitate sharing of user-created extensions of the software. We've included one example plugin to serve as a reference for developing additional plugins, and plan to document everything in a future release. Overall stability of the application is also improved.
After stabilizing the data model in the 2.0 release, we've been busy with some major updates to the cadnano user interface in the last couple months. Read below for what's new.
Edit: update to 2.1.1