There are also hardware-based efforts, like BoxLambda[0], Agon[1], MEGA65[2], Uzebox[3], F256[4].
0. https://epsilon537.github.io/boxlambda/
1. https://www.thebyteattic.com/p/agon.html
2. https://mega65.org/
3. https://uzebox.org/
4. https://wildbitscomputing.com/