XFracky is a simple multithreaded Tcl/Tk 8.0 based application for rendering fractals (2d, 3d and animations) using methods such as borderscanning and iteration tracking. New fractal types can be added as plugins. There is a demo-mode which continously renders any of a set of preconfigured fractals. It has support for 8/16/24/32 bit displays. The thread support is based on clone() and the number of threads is only limited by the system ressources. Thread-safe libraries are not required.