DIY Electronics US
Techno Hub: A full-featured Raspberry Pi RP2040 in the smallest footprint yet is Mirek Folejewski's Femto Module.
DIY Electronics US
StackyPi - A Raspberry Pi RP2040 board with Raspberry Pi Zero form factor (Crowdfunding) - CNX Software
StackyPi The Pi Hut
RP2040 Microcontroller - Raspberry Pi
Seeed Studio's Latest XIAO Board Packs a Raspberry Pi RP2040 Into a Tiny Thumb-Size Dev Board
StackyPi - Based on Raspberry Pi RP2040 MCU
StackyPi : Based on Raspberry Pi RP2040 MCU by ashish — Kickstarter
StackyPi - Based on Raspberry Pi RP2040 MCU
RP2040-Zero, Pico-like MCU Board Based on RP2040, Mini Version (w/o Header) - RobotShop