Here's a preliminary version of Gambit Scheme for the Android platform, inspired by Marc Feeley's iOS version.
Gambit Scheme is a "complete, portable, efficient, and reliable implementation of the Scheme programming language, conforming to the R4RS, R5RS and IEEE Scheme standards, and implementing all optional features. Tail calls and first class continuations conform to the Scheme semantics. The full numeric tower is implemented, including: arbitrary precision integers (bignums), rationals, inexact reals (floating point numbers), and complex numbers."
Gambit for Android includes the ability to interact with a Gambit Scheme REPL (read-evaluate-print-loop), add and save Scheme scripts, and start and telnet into a REPL server running on the device.
Bug fix: some multiline expressions entered in the REPL window were not being evaluated properly (this bug did not affect expressions entered via "scripts" or via the REPL server).