TinyELF - A freeware emulator of CDP1802 based microcomputers for Mac OS X. - http://homepage.mac.com/ruske/tinyelf/
uBee512 - Open source Premium Microbee 512Kb FDD emulator for Linux and Windows. - http://sourceforge.net/projects/ubee512/
Emu48 - An open source HP38/39/40/48/49 emulator for Windows. - http://hp.giesselink.com/emu48.htm
Emu28 - An open source HP18C/28C emulator for Windows. - http://hp.giesselink.com/emu28.htm
vmips - An open source MIPS R3000 emulator for Unix. - http://vmips.sourceforge.net/
Project8080 - Covers the development of a Heathkit H8 emulator on Macintosh. - http://davidwallace2000.home.comcast.net/h8/project8080_archive/
Newbrain Emulator Pro - A freeware Grundy NewBrain emulator for Windows written in Delphi. - http://newbrain.1111mb.com/
Altair32 - An open source Altair emulator for Windows. - http://www.altair32.com/
Solace - An open source Sol-20 emulator for Windows. - http://www.sol20.org/solace.html
EmuLTI 8 - An open source Mitsubishi Multi 8 for Windows and Windows CE. - http://www1.interq.or.jp/~t-takeda/multi8/
EmuPIA - An open source Toshiba Pasopia emulator for Windows and Windows CE. [English/Japanese] - http://www1.interq.or.jp/~t-takeda/pasopia7/
XRoar - An open source Dragon 32/64 and Tandy CoCo emulator for Linux , MacOS/PPC, GP32, and Windows. - http://www.6809.org.uk/dragon/xroar.shtml
SPRINT - A freeware Sprinter emulator for Linux/i386 and Windows. - http://www.nedopc.org/nedopc/sprinter/sprint.shtml
HiRISC Simulator - A freeware emulator for Windows of a system designed specifically for the Applied Systems Programming course at the University of Akron. - http://www.cs.uakron.edu/~margush/307_Old/HiRISC/
blueMSX - An open source SVI318/328, MSX1, MSX2, MSX2+, and Turbo-R emulator for Windows. - http://www.bluemsx.com/
PearPC - An open source PowerPC emulator for Unix and Windows. - http://pearpc.sourceforge.net/
GXemul - An open source MIPS machine emulator for Linux. - http://gavare.se/gxemul/
Virtual Alpha Micro - An open source AM-100 micro computer emulator for Cygwin, Linux, and Mac OSX. - http://www.otterway.com/am100/
FunnyMu - A freeware Creativision, Funvision, and Whizzard emulator for Linux/SDL. - http://www.lemoncube.com/26.html
KCemu - An open source emulator of the KC85 homecomputer series for Linux and Windows. - http://kcemu.sourceforge.net/
CP/M - An open source CP/M-80 ver2.2 emulator for MacOS. - http://homepage3.nifty.com/bugbug/cpm/
SIMH - An open source collection of emulators for Windows of historical computers, including GRI-909, HP 2116/2100/21MX, IBM 1401/1620/1130/System 3, PDP-1/4/7-11/15/VAX. Also provides software kits, system photographs, and technical papers. - http://simh.trailing-edge.com/
Emu51 - An open source 8051 emulator for Linux and Windows. - http://emu51.sourceforge.net/
mic1 - A Java-based simulator which implements the Mic-1 microarchitecture described in Chapter 4 of Andrew S. Tanenbaum, Structured Computer Organization, Fourth Edition. [Open source, GPL] - http://www.ontko.com/mic1/
Desktop Cyber - An open source CDC (Control Data Corporation) Cyber 6x00, 7x or 17x type mainframe emulator for Windows or Unix. - http://members.iinet.net.au/~tom-hunter/
Japanese Computer Emulation Centre - A site dedicated to the emulation of Japanese Machines including X68000, PC6001, PC88, PC98, MSX 1/2/R, Sharp MZ, Sharp X1, Fujitsu FM7, and Fujitsu FM Towns. - http://www.jcec.co.uk/
Emuviews - Great emulation page maintained by JoseQ, maker of the famous Rumor Mill, many downloads, great layout - some hosted sites. - http://www.emuviews.com/
cinc - An open source Bell Labs cardiac emulator for Linux and Windows/Cygwin. - http://sourceforge.net/projects/cinc/
st20emu - A freeware ST20 emulator for DOS. - http://sourceforge.net/projects/st20emu/
Evenson Consulting Services' SWTPc 6800/6809 Emulator - Windows 9x/NT GUI emulation of SWTPc 6800 and 6809 systems. A Simulated Machine Environment (SME) emulation plus .dsk file downloads. - http://www.evenson-consulting.com/
Emula3 - Contains emulators for many different computers and calculators/PDAs for many different platforms. [English/Italian] - http://www.emula3.com