CollageIt Pro for Mac is a professional Photo Collage makers software. You can create stunning photo album or Mac Walls or greetings card in seconds using 45+ stunning templates, 4 collage style, 50+ background patterns, 20+ effects.
Software normally costs $29.00 but it's now free for limited time as part of a special giveaway organized in HowBigDeal.
Sorta seems legit. The registration page harvests your email address and then forwards you to a direct download link (use this link if you wish to by-pass the rego) from www.collageitfree.com that contains the software and a text file with a serial number.
Note that this is the old version of CollageIt Pro - although still being sold, the App Store has CollageIt 3 Pro listed as the latest release.