There was a multi-vendor standard for Transputer modules called TRAMs: they were a bit shorter and a bit wider than a modern DIMM, and used pins on the short ends rather than PCB fingers.

A common TRAM had a CPU and 4MB of RAM. You'd get a bunch of those, maybe a graphics TRAM, a SCSI TRAM, etc, and build a machine using a carrier board with maybe 8 or 10 slots.