This article is from the alt.comp.hardware.homebuilt Frequently Asked Questions. It is maintained by Mark Sokos (msokos1@gl.umbc.edu) with many contributions from others.
AIM-Spice (student version available free) http://fulton.seas.virginia.edu/~ty2n/aimspice.html
Deutsch Research: DR SPICE http://www.deutsch.com
Microsim PSpice http://www.microsim.com
PADS software PowerPCB, WIN95 and Unix http://www.pads.com
Spectrum Software: Micro-CAP V (SPICE, PSpice compatible) http://www.spectrum-soft.com
SynaptiCAD: WaveFormer Pro http://www/syncad.com
Simetrix From Newbury tech http://www.newburytech.co.uk/index.html
http://home.aol.com/drvgb Home Page for DrVGB
http://home.aol.com/drvgb Intusoft - WWW Directory Listing
Intusoft are releasing their schematic editor for Windows 95 and NT as freeware; the beta version can be downloaded from http://www.intusoft.com It is about 5Mbyte of code, installed. The much smaller Circad package is available as a not-too-seriously crippled demonstrator from http://www.holophase.com
http://http.ee.queensu.ca:8000/www/dept/courses/elec221/pspice.htm PSPICE Links
http://www.ece.uwaterloo.ca/~pwr_elec/spice.html Unofficial List of SPICE Resources
http://ftp.heise.de/pub/elrad/051/
Logysis is part of the simtel archives at ftp://oak.oakland.edu (and other mirror sites)
TurboSIM http://www.islandlogix.com
http://www.blackbelt.com/blackbelt/bx_home.html
Windraft from Ivex (shareware CAD schematic editor) and Winboard (PC board layout tool) Both can be obtained at ftp.ivex.com . Ivex also has a webpage at http://www.ivex.com
There is some free pcb layout software offered by Protel, at ftp://ftp.protel.com http://www.protel.com
http://www.bestproto.com/ftpsite
Go to the FreeBSD homepage (http://www.freebsd.org) and follow the links to the "cad" group of "ports". Look for "pcb" for PCB layout and "chipmunk" for schematic capture. Also, there is a digital schematic tool called 'diglog', and an analog version called 'analog'. ftp://freebsd.cdrom.com/pub/FreeBSD/ports-current/cad For general information on FreeBSD ports: http://www.freebsd.org/handbook/handbook24.html#26
Niche Software's PCB Designer (Windows based PCB CAD program) A fully-functional (except for printout) demo is available from ftp://ftp.demon.co.uk/pub/ibmpc/win3/apps/pcbdemo/pcbdemo.zip
 
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