With test boards, too. They cost an arm and a leg but just saying it was put into production & even available. Same, proven I.P. w/ GPL license could've been printed on 350nm or 500nm in a shuttle run to get a cheap microcontroller.

On side of riskier ones, there was Plasma MIPS and Amber ARM that might have been turned into ASIC's. Less risky, but less supported, OpenRISC was turned into one. RISC-V is best contender right now far as most openness and industry support. Great there's boards with some of them. Leon is still ahead in terms of features & performance on something you can actually buy. I still think someone should try converting the Leon3 + libraries to a RISC-V to get its I.P. as a starter pack.

And many more, just not in America it seems! Here:

https://opencores.org/projects