Frakter is a fractal exploration application designed to handle the same feature set the FractInt has. It was started as an entry in DMz's annual programming competition, but now it is a GPL fractal generation library with a GUI.
The currently available version, 0.1, can be seen as a proof-of-concept implementation. The next generation, version 0.3, will have a similar, but more generic, class hierarchy and an OpenGL based rendering engine.
Look here for screenshot from the current version.
Look here for a preview of Frakter 0.3 (in early alpha mode!)
You can reach me at e8johan -at- digitalfanatics -dot- org, or visit my homepage.
Frakter 0.3 will be released very soon!