"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.designers-guide.com/
Much useful information on analog simulation including source code and reference material for the VBIC BJT model. Edited by Kenneth Kundert who is the original developer of the Sparse matrix solver used at the heart of all SPICE3 based simulators including SIMetrix.
http://www.arraydesign.com/downloads/index.html
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.semiconductors.philips.com/Philips_Models/
Source code and documentation for MOS9, MOS11 and MEXTRAM
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