Other/Non-Mac architecture (91 software)
Other/Non-Mac CPU's (such as Apple I/II/III 6502 or IIgs 65C816)

Motorola 68K (3531 software)
Motorola 68K groups together all CPU's made in the 1980's and early 1990's such as those CISC Lisa and Mac CPU's: 68000, 68020, 68030, 68040 and floating point units such as the 68881 and 68882

68K + PPC (FAT) (2969 software)
FAT binaries included code for both the 68K and PowerPC architectures in the same application file that could be run on both 68K and PowerPC Macs.

IBM PowerPC (2467 software)
The PowerPC chip was a team effort made by IBM and Motorola in the early 90's and gave birth to those RISC Mac CPU's: PowerPC 601 (G1), 603/604 (G2), 750 (G3), 7400 (G4) and 970 (G5)

OSX Universal Binary (316 software)
Universal Binary was made to accommodate the transition from PowerPC architecture to Intel's in 2006.

Intel x86-64 (179 software)
Intel x86-64 was a CISC attempt to Macintosh hardware and includes the most popular and recent CPU's such as: Core Solo and Core Duo, Xeon, Core 2 Duo, i3, i5 and i7