AppleIIGo is an Apple II emulator.

AppleIIGo 1.0 is written in Java, and is available as a Mac OS X widget, a webpage Java applet, and a mobile phone midlet.

It is developed by Marc S. Ressl, and currently maintained by Nick Westgate.

If you are looking for a cross-platform emulator of the entire Apple II family, check out OpenEmulator: