gimxos
Use Your favorite input method to play on PlayStation 4 and Xbox One
...Beside the software it requires to assemble DIY adapter from off the shelf parts to emulate original controllers and translate the input from serial port. Little or even no soldering required.
With minimal knowledge one can build an advanced standalone alternative to comercial input mulitplexers for approximately 30$ at home.
Complied GIMX binares can be found here: https://gimx.fr/wiki/index.php?title=Installation
Project source code is availabe in Matlo's GitHub: https://github.com/matlo/GIMX