Parallax Propeller is multi-core microcontroller development platform. The Parallax P8X32A Propeller chip, introduced in 2006, is a multi-core architecture parallel microcontroller with eight 32-bit RISC CPU cores. It can be programmed for example with Propeller Assembly language, Spin interpreter and C programming languages.
Interesting news on this platform is that Parallax Propeller 1 Goes Open Source. On August 6, 2014, Parallax Inc. released the Propeller P8X32A Verilog and top-level HDL files under the GNU General Public License 3.0. I think it is a trust and an ecosystem thing: while is has a loyal following with hobbyists, it really hasn’t ever hit the big time. Propeller isn’t like traditional microcontroller, so it is a bit of a business risk to have vendor lock-in. Now you now no longer have to worry about second sourcing this part even if it went EOL.