You could have downloaded Wallcast 0.98 from our software library for free. The actual developer of the free software is LimeFlag. Wallcast lies within Desktop Tools, more precisely Themes. The most popular version of the program is 0.9. Wallcast.exe is the most common filename for this program's installer.
From the developer:
Wallcast turn your desktop background into a personalized display of pictures from you, your family and your friends. Multiple times per day, your wallpaper will be refreshed to display a fresh collage of photos you like, stunningly presented on a beautiful background image of your choice.
Wallcast allows your family and friends to send photos to your wallpaper and you can send the latest photos you snapped to theirs.
You may want to check out more software, such as Abstract2 or Q++ World Clocks Desktop Wallpaper BETA, which might be similar to Wallcast.