I've been working on fr0st quite a bit lately. There aren't many new features, but innumerable little improvements here and there. The app is now much more solid, and all kinds of corner cases have been fixed.
In addition, rendering is now a bit faster, as there have been some improvements in how flam3 is integrated into the python code. The difference is very visible when rendering thumbnails.
With all those improvements done, I'll be making a new release as soon as I have the time to go over the few remaining bugs and make sure the app is rock solid.