There's the symbiflow umbrella project that subsumes icestorm. In addition to ice40, they have apparently a working synthesis toolchain for lattice ecp5, and ar

There's the symbiflow umbrella project that subsumes icestorm. In addition to ice40, they have apparently a working synthesis toolchain for lattice ecp5, and are working on supporting xilinx series 7. https://symbiflow.github.io/ https://symbiflow.github.io/ That being said, AFAIU newer generation fpgas from xilinx and Intel have encrypted bitstreams, foiling reverse engineering attempts. One can hope that the emergence of an open source synthesis toolchain would encourage new entrants by lowering the entry barrier.