Some ideas for ports to OS kernels:

[[https://hadrons.org/~guillem/debian/ports/gnu-any/|Debian GNU/Any]]
Xnu
Plan9
Haiku
ReactOS
OpenSolaris
[[http://menuetos.net/|MenuetOS]]
[[https://sel4.systems/|seL4]]
[[http://genode.org/|Genode OS]]
[[http://www.minix3.org/|Minix 3]]
[[http://www.redox-os.org/|Redox]]
[[http://plan9.bell-labs.com/plan9/|Plan 9]]
[[http://akaros.org/|Akaros]]
[[https://blog.minocacorp.com/minoca-os-a-new-open-source-operating-system-4bb7998df3a7|Minoca]]
[[http://toaruos.org/|ToaruOS]]
[[https://fuchsia.googlesource.com/|Fuchsia]]

Some ideas for ports to hardware:

[[WikiPedia:LatticeMico32|LM32]]
[[http://riscv.org/|RISC-V]]/[[http://www.lowrisc.org/|lowRISC]]
[[http://elbrus2k.wikidot.com/|Elbrus E2K]]
[[https://en.wikipedia.org/wiki/ETRAX_CRIS|ETRAX CRIS]] (cris-linux-gnu)
[[https://en.wikipedia.org/wiki/TILE-Gx|TILE-Gx]] (tilegx-linux-gnu)
[[https://www.parallella.org/2016/10/05/epiphany-v-a-1024-core-64-bit-risc-processor/|Epiphany]]
[[WikiPedia:Category:Instruction_set_architectures|more]]

Some ideas for ports to software defined architectures:

[[https://lwn.net/Articles/674770/|CloudABI]]
[[WikiPedia:WebAssembly|WebAssembly]]
Apple Bitcode
LLVM IR

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CategoryPorts