"Probably the most important analog simulator feature is convergence. SIMetrix converges as well and runs as fast as the industry leader and is much more flexible to run."
http://www.designinganalogchips.com/
Book available for free download. As well as being a good introductory course to designing analog ICs, this book is also an entertaining read even for experienced designers.
http://www.aboutspice.com/
Vendor independent source for SPICE simulation.
http://www-device.eecs.berkeley.edu/~bsim3/
Source code and documentation for BSIM3 and 4
http://www.nxp.com/Philips_Models/
Source code and documentation for MOS9, MOS11 and MEXTRAM
http://www.designers-guide.org/VBIC/index.html
Source code for VBIC implementation used by SIMetrix
http://embedded.eecs.berkeley.edu/pubs/downloads/spice/index.htm
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