There are many 8051 clones available.. it's one of the cheapest microcontrollers you can buy, but popular no doubt due to installed base plus tools from Keil.

There are many 8051 clones available.. it's one of the cheapest microcontrollers you can buy, but popular no doubt due to installed base plus tools from Keil. But it's certainly not the only Harvard architecture processor still in use. Microchip's PIC is the other big one- in fact it predates the 8051, having been available from General Instruments since 1976.