The IGN free game of the month for February is Mass Effect: Infiltrator.
http://m.ign.com/articles/2015/02/09/ign-free-game-of-the-month-mass-effect-infiltrator
W.E.L.D.E.R. is free. I've gotten a lot enjoyment out of this title and recommend it to anyone who likes word games.I think it's usually $2.99. Now, if I could just rediculous fishing for free...
Just found Phoenix Wright Trilogy HD collection for free as well as a Professor Layton title. The HD collection is normally $16.99. Ghost Trick: Phantom Detective is free, too!