AppleIIGo is an Apple ][ series emulator written in Java, programmed by Marc S. Ressl. The latest 2.0 beta (build 301) is available from the AppleIIGo Project Site.
According to Marc, “This build implements an Apple IIc ROM 04 with two 5.25? disk drives, two UniDisk 3.5? disk drives, and two SmartPort hard disks. It handles these file formats: DSK, D13, PO, NIB, V2D, 2IMG, HDV, FDI. There is no speaker sound nor NTSC for now. This build is only Mac OS X, I am working on portability. Windows and Linux folks, stay tuned!”