@neomoevius open-source toolchain for FPGA:
Last I checked it was the only thing like it, but it was also targeting a specific device and I'm not sure if that's changed since the last time I did a deep dive.
@jjg The two biggest providers are Xilinx (with 51% of the market) and Altera. Xilinx appears to has made a killing with their focus on the ARM ecosystem. Intel bought Altera a couple of years ago, for $16 billion, so they're the second largest or the largest FPGA manufacturer, depending how you look at it. The circle is getting narrower. If you're aiming to support ARM due to their energy efficiency for example, Xilinx is a better way to go.
My 5 minutes worth of research indicates that #icestorm has the capability of providing an open-source toolkit (now I just need to figure out if what I want to do will fit within the #fpga it supports :) )
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