Amazon.com: RJ45 GPIO Pinout Breakout Board for Raspberry Pi 1A+ 1B+ 2B 3B 3B+ 3A+ 4B Zero-W : Electronics
Breakout Boards - Cookbook | Mbed
NeweggBusiness - 2PCS DB9 Solderless RS232 DSUB Serial to 9pin Port Terminal Male Adapter Connector Breakout Board with Case Long Bolts Tail Pipe 2PCS Female
GPIO 40pin Breakout Expansion Board - Wiki
DS-101, DS-103, 13 PIN DIN Breakout Board/Prototype Breadboard for The Roland GR-33 GR-20 GR-30 VG-88, VG-99 GR-55, GK-2a, GK-3 (Breakout): Amazon.com: Industrial & Scientific
40 to +85C Screw Terminal Breakout Board, 40-pin – Apex Embedded Systems LLC