Hello, hope not being out of topic here, I would present a little board I developed in last few months:
HID2AMI is an HID USB Mouse and HID Joy/Gamepad adaptor built for the Amiga computers.
It is open sourced hardware, and it is firmware upgradeable for improving compatibility with a growing number of peripherals.
Anyone interested can read all details, instructions, compatibility list on HID2AMI Github here.\
Further information and user's usage feedbacks here (follow the thread)
I will appreciate comments and suggestions. Thanks !