There was a download of PropDesign 1.1 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software relates to Multimedia Tools. The following version: 1.1 is the most frequently downloaded one by the program users. This free software was originally produced by Dokus-Dubner. The program's installer is commonly called PropDesign.exe.
From the developer:
PropDesign is a Windows port of Ed Dokus' DOS/BASIC propeller design program. It calculates propeller pitch, diameter, chord, thrust and efficiency when given a propeller type (planform, airfoil, number of blades, etc.) and cruise conditions (airspeed, altitude, etc.). Output is in graphical or tabular form, allowing an experimental aircraft designer to ask "what if?" without having to carve/bolt on/fly each new design.
You may want to check out more software, such as Xfire Plus: Music Plugin, Blue Cat's Stereo Flanger - VST or Alienware AlienFX, which might be related to PropDesign.