Frogatto is available for purchase in the Humble Store for Mac and Windows (Linux will be added soon):
(Note: since a few people have been confused by this, there isn’t, at the time of this writing, an actual “storefront” site for the Humble Indie Store; the widget shown above is the only place you can use to buy it from from the HIS.)
You can purchase it from the Mac App Store as well.
The engine that drives Frogatto, Anura, is Open Source and available on GitHub.
Please note: Frogatto automatically uploads anonymous usage data while you play (if you are connected to the internet), to help us improve the quality of the game.