Jux 4.001 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Jux lies within Photo & Graphics Tools, more precisely Viewers & Editors.
The program's installer file is generally known as Jux.exe. We recommend checking the downloaded files with any free antivirus. The actual developer of the software is XenoDream Software Ltd. The most popular versions among Jux users are 2.9, 2.8 and 1.6.
From the developer:
Jux is a fractal explorer for 2D Julia and Mandelbrot sets. It includes a variety of formulas and it has beautiful coloring and lighting effects. It features fully multi-core for preview, explorer and rendering, render large pictures with full anti-aliasing, batch rendering, 12 steps of undo/redo, memory spots for temporary storage of formulas, coloring or lighting, powerful heightfield lighting effects, and more.
You may want to check out more software, such as Panorama Maker, OB WMP11 or Focusviewer, which might be similar to Jux.