https://www.kickstarter.com/projects/544088930/bliss-box-4-play-one-adapter-for-many-controllers-0

Here is a usb interface for many older controllers that works on any device with a usb interface, window, Linux, macs,Pi, androids, RetroN 5, ps3, ect. It's based on the Bliss-Box project but aim is at mass production. A KS is now in effect to get support to make it a reality.

A full list of known working controller is here.
Link

The 4-Play is a universal console-to-USB controller adapter with 4 ports allowing up to 4 players to play at the same time with almost any controller of their choosing (see compatibility List). It uses low cost adapter cables which allow a variety of console controllers to plug into the 4-Play's universal HDMI style controller port. This allows the 4-Play to support a wide variety of controllers on each port.

The KS is here.
https://www.kickstarter.com/projects/544088930/bliss-box-4-play-one-adapter-for-many-controllers-0

Here is a review by Racket boy.

A review by Lon

And hoping to see one by gamester81 🙂