You could have downloaded MacFDTD 0.8 for Mac from our application library for free. The actual developer of this Mac application is JadeChord Technologies. The program lies within Audio & Video Tools, more precisely Editors & Converters.
From the developer:
Macintosh silicon layout and simulation software. Create semiconductor and optical circuit designs, and test them out before fabrication. The initial release featured basic layout abilites, 5-function variable equation support, and basic GDSII format exporting.The second release added full support for saving and loading files associated with the .fdtd extension. This is an format I've introduced just for this program.
You may want to check out more Mac applications, such as MFilter, Aiseesoft WMV Converter for Mac or AkBrowser, which might be related to MacFDTD.