As far as I know, there are no free software x86 emulation programs for the 'Classic' Mac OS. All cost money, and all are discontinued.

The big two were Soft[PC/AT/Windows] and Virtual PC. Microsoft bought out Connectix, and took over development and sales of Virtual PC, but stopped development on it when the Intel Macs came out. They have made the Windows version of Virtual PC free, but the Mac version (which only works on PowerPCs,) still costs money, if you can find it.