Mostly I wanted to mention RISC V emulators.
QEMU can emulate both 32-bit and 64-bit RISC-V CPUs. 
We have  qemu-system-riscv64 executable to simulate a 64-bit RISC-V machine
or qemu-system-riscv32 executable to simulate a 32-bit RISC-V machine.

SiFive are planning to release a development hardware board this summer, according to some page on the internet; the HiFive Pro P550.