Humble Bundle: PC and Android 9

Although only two charities benefit from this bundle, the quality of the games hasn't waned.

Pay $1 for Broken Sword 2: The Smoking Mirror, Bridge Constructor, Type:Rider, and Ravensword: Shadowlands. Paying more than the average, currently at $3.80 gets you Kingdom Rush and Knights of Pen and Paper +1 Edition. There are also some unannounced titles which you will automatically get for beating the average. For the $1 tier, you will also get soundtracks for Broken Sword 2: The Smoking Mirror, Bridge Constructor, Type: Rider and Ravensword: Shadowlands.  The second tier also gives you Kingdom Rush's OST.

As usual the bundle is available at Humble Bundle's homepage and this bundle is redeemable on everything but iOS.  This means Steam, Android, Mac and Linux.