RetroRosetta

https://www.tindie.com/products/grechtech/retrorosetta-receiver-universal-blueretro
Bluetooth to classic consoles adapter with full remapping support based on BlueRetro (DE9) for Atari 2600/7800, Commodore, MSX, Sinclair, etc
Wireless controllers for Wii, Wii U, Switch, PS3, PS4, PS5, Xbox One & Xbox Series X/S are supported, as well as controllers from 8bitdo, Retro-Bit, RetroFighters, etc (including Xbox Adaptive Controller via Bluetooth / BLE)
Power usually provided from the console - USB C power only required for a handful of systems: Wii-Ext, CD-i or vintage PCs
Supports open source BlueRetro firmware with a portion of profits going to the developer
Open specification connector with 3D case CAD models available

This open source, open hardware project started at https://github.com/GrechTech/RetroRosetta/ and has v2 information at https://github.com/GrechTech/Rosetta/ and elsewhere. Grech, the author, described this as the reason the project was created: "Big initial driving factor was to improve accessibility with retro consoles (by supporting remapping and the Xbox Adaptive controller amognst others), with a side focus on reducing e-waste (by supporting multiplayer and DIY adaptors made from recycled controller cables, hopefully allowing people to avoiding need 2-4 controllers for every system they own)".