programming/scripting on an Android device - suggestions ?

Hello all,

I would like to be able to program/script on a smartphone itself (meaning:
not having to use a PC).

I did find a script-language launcher but surprisingly no APK downloads to
programming/scripting languages.

I've found some mentioning of a few different programming/scripting
languages (like lua and python), but surprisingly no indication of APK
downloads to any of them.

Question:

Does someone know of websites offering APKs for download ?

- or even better: websites which offer the APK as well as containing a
tutorial to its usage (on an Android smartphone).

Regards,
Rudy Wieser