I was tipped off about this on Twitter, but since I was swamped in birthday greetings, I have to apologize for not being able to name the chap who let me know. In any case, Broken Sword: Director's Cut is free on iTunes at the moment.
There really isn't much I need to say. Whether you've played it or not, you know what Broken Sword is. This classic adventure game was ported to iOS a while ago and by all accounts, it's a good effort. Regardless of how much you like adventure titles, you ought to snap this one up. So go do it!
[Found a free App for iOS or Android? Think it's good? Hitting me up on Twitter is the fastest way to let me know about it. Please do so -- finding good free games is hard!]