Just thought I'd start a thread where HT denizens can share the 411 on free apps that they think would be of interest to others. By "free", I mean apps that don't involve paying money at all or apps that offer enough free content to be still be cool and useful, even w/o opting to purchase anything. Whether it's for iOS or Android, it's all good.

My latest discovery is Dream:ON, an iPhone app designed to influence your dreams using aural soundscapes. The app even includes a multi-tone alarm clock that will wake you gently from your slumber.

This dream app may or may not work for you. But hey, it can't hurt to try since it's free. Have fun!