At this time, I have the following boards for experimenting and prototyping
| FPGA | Board | Notes | Cost (Source) | Toolchain License |
|---|---|---|---|---|
| Xilinx Spartan 6 XC6SLX9 | Mojo v3 | 33€ (ebay, China) | proprietary | |
| iCE40-HX8K | iceFUN | £30 (Robot Electronics, UK) | open-source | |
| iCE40-UP5K | UPduino v3.0 | I2C cores | $24 (tindie, USA) | open-source |