There are a number of Electric libraries available for free download.
Boise State standard cells.
Students at Boise State University
created a standard cell library.
These cells use the MOSIS Submicron design rules with 3 layers of metal,
suitable for fabrication in On Semiconductor's C5 process.
See their site for more information.
Sun Microsystems Test chip. Designed at Sun Microsystems Laboratories,
this chip
has over 1 million transistors and was used to measure on-chip and inter-chip capacitance structures.