Are you a hardcore programmer? Then implementing a RISC-V processor on an FPGA is right for you. It involves using the programmable logic to create a "soft core" of a RISC-V CPU. Instead of using a fixed, off-the-shelf processor, designers can instantiate a RISC-V core, available as hardware description language code like Verilog or VHDL, within the FPGA. 

The existing FPGA implementations are:

- RISC-V CPU: https://github.com/lnis-uofu/OpenFPGA

- Java VM: https://github.com/amal029/jop

We can implement GPU on FPGA, it can be effectively used for the custom hardware accelerators for graphics processing, offering advantages in low latency, and integration for specific applications.