What FREE-WILi 2 is

FREE-WILi 2 is a handheld, open-hardware electronics multitool: a pocket lab for GPIO, analog I/O, wireless protocols, and retro gaming, built around two RP2350 microcontrollers plus a Raspberry Pi CM0 running Linux.

The best source of information on what Free Wili 2 is - is the main website.