...It currently supports monophonic note playing with configurable waveform, frequency scale, control area, and control orientation. Basic recording function is also included (WAVEformat).
Etheric Synthesizer works on Android version 2.0 and above.
NecJGui is an antennas design tool, interface for Numerical Electromagnetic Code. It allows easily making NEC input files, and viewing them in 3D. It also contains a version of the simulator, so it's complete IDE for full-wave EM simulation.