Woolah - Knockout Photo challenges with your friends.
Mockuuups Studio - Fast and easy way to create product mockups on macOS, Windows and Linux.
SPAR! - Challenge your friends. Put money on the line. Get better.
Mediamodifier - Create beautiful designs and product mockups in seconds.
ShutterSpots - Find & share photo locations nearby & all over the world!
Mockuper - Instant Mockup Generator