LambdaNative is a cross-platform development environment written in Scheme, supporting Android, iOS, BlackBerry 10, OS X, Linux, Windows, OpenBSD, NetBSD, FreeBSD and OpenWrt.
I could make a toy mobile app for this site, it's not too ambitious. Lambdanative is built on top of Gambit Scheme which is excellent.
Some guy made a rogue-like videogame with it: https://featurecreeps.itch.io/corpsewizard