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MOSIS and Tanner
There are few standard cell libraries publicly available for web download. The best source of information is probably at the MOSIS SCMOS Design Kits web page.
There are 0.5µm, 0.35µm and 0.25µm standard cell libraries available from MOSIS designed by Tanner Research. These are available in CIF and GDS formats using the standard MOSIS layer definitions, and so should be readable by any software.
The 0.25µm library uses the SCN5M_DEEP rules with lambda=0.12µm. The cell height measured between the power rails is a low 54λ (6.48µm). Outside the rails are two metal connectors labelled clk and rst which extend the cell height to 72λ. This extra space is used for poly wires in some cells, so the true cell height is 72λ (8.64µm).
The metal-1 layer has a 6λ pitch, 3λ wide with 3λ spacing. The Metal-2 pitch is 9λ (1.08µm). Cell widths are a multiple of 4½λ wide which isn't fully standard and could give placement problems.
All the cells seem to use a standard P transistor width of 11λ (1.32µm) and an N transistor width of 7λ (0.84µm), so the performance will be quite low. The low cell height also forces the use of metal-2 crossovers inside the cell which will impact the routability.
The libraries come with a nice data sheet (right) which includes a drawing of the layout. There are 41 cells in the library.
Dreal image of basic 2-XOR gate
Example of Tanner standard cell data sheet