1. Bernie ][ The Rescue (v0.1.2.5i / MacOS)

   Not only does Bernie ][ The Rescue support the Apple ][GS, but incredibly wide compatibility ranging from simple games to the clasic Castle Wolfenstein make this the emulator of choice. Although Bernie does have a small little $25 price tag on its head, the professionality and support that the authors offer is incredible!

2. AppleWin (v1.30 / Win9x)

   It's freeware, it's pretty good, I like it, I have no clue about the other Apple ][ emulators... bite me.

I never had an Apple ][ computer, but I always used to use them at school. In 3rd grade, I programmed some fun little games in class... here's some example source code of what it would be like: