Apple II

Applelet - An Apple ][ emulator written in Java.
http://www.fasterlight.com/hugg/projects/applelet.html

Catakig - Mac-hosted emulator of the Apple ][, ][+, and //e. Rationale, screenshots and downloads.
http://catakig.sourceforge.net/

Twoapple - Open source emulator for Linux written in the D programming language.
http://code.google.com/p/twoapple/

OSXII - A freeware //e emulator for Mac OS X utilizing Cocoa and OpenGL.
http://apple2.intergalactic.de/

Linapple - Open source emulator for Linux.
http://sourceforge.net/projects/linapple/

ActiveGS - An ActiveX-based Apple IIgs emulator created by members of the Free Tools Association. Also, FTA demos, games and tools that run in the emulator.
http://www.freetoolsassociation.com/

casaGS - Site hosting the Apple IIgs emulators XGS-DOS for MS-DOS and KEGS-OSX for Mac OS X.
http://www.casags.net/

Bernie ][ The Rescue - An Apple IIgs emulator for Power Macintosh.
http://www.bernie.gs/Bernie/

Virtual ][ - A shareware ][, ][+, and //e emulator for MacOS X.
http://www.xs4all.nl/~gp/VirtualII/

Dapple Emulator Series - Features Dapple and NDapple, two open source ][, ][+, and 64K //e emulators for DOS, and Dapple2 an open source 128K //e emulator for DOS.
http://sourceforge.net/projects/dapple/

KEGS - Kent's Emulated GS - An Apple IIgs emulator for Linux, Unix/X11, Win32 and Mac OS X. Source code is available.
http://kegs.sourceforge.net/

PsiApple - An Apple ][+ emulator for the Psion Series 5 palmtop.
http://www.fasterlight.com/hugg/projects/psiapple.html

AppleWin - An open source Apple //e emulator for Windows.
http://developer.berlios.de/projects/applewin/

iGS-Mac - An Apple IIgs emulator for PowerPC and higher-end 68K Macintoshes. Based on XGS and formerly known as XGS-Mac.
http://www.openprojects.rarcoa.com/~justmike/XGS-Mac/

Sara - Preliminary version of an Apple /// emulator for Macintosh.
http://www.blackcatsystems.com/software/sara.html

PalmApple - An Apple II emulator in development for the Palm OS.
http://palmapple.sourceforge.net/

Rich Skrenta's Apple II emulator in C - The C source for an Apple II emulator.
http://www.skrenta.com/a2/

KEGS/SDL - A version of the KEGS Apple IIgs emulator that uses the cross-platform SDL multimedia library.
http://devernay.free.fr/apple2/

KEGS32 - An Apple IIgs emulator for Win32 based on KEGS.
http://www.geocities.com/akilgard/kegs32/

Apple II Oasis - A shareware Apple //e emulator for Windows. Includes a disk image manager and an Apple II to PC data transfer utility.
http://www.geocities.com/apl24win/

AppleUni - An Apple ][+ emulator for DOS.
http://dr.ea.ms/

AppleCE - An Apple II emulator for Windows CE-based Pocket PC devices.
http://www.geocities.com/bonelyfish/applece.html