There are 2 repositories under uf2 topic.
Converts binary files to Microsoft's UF2 format https://github.com/Microsoft/uf2
A small BootLoader that upgraded firmware through USB
A tool for the Arduino IDE to make a UF2 file from a compiled sketch binary .bin file.
CMake build system for Atmel SAM MCUs. Provides toolchain and variables
Waveshare 240x240 LCD and Joypad demo for Raspberry Pico
MakeCode UF2 bootloader for STM32 Blue Pill
Arduino Blink made into a UF2 for STM32F411 Blackpill. First, tinyuf2 for Blackpill needs to be flashed as the bootloader. This UF2 file can then be copied to the MCU.