Replicape is an open source hardware and software project for bringing 3D printer capabilities to the BeagleBone and BeagleBone Black
Throwing some motors are okay but making them go with the LoadCape is much more sophisticated.
BeagleBone Black 0.96" OLED Display 128x64 pixels
Replace the brain in your LEGO MINDSTORMS EV3 with a BeagleBone Black.
Turning DNA into Data
I2C relay UART RS232 optocoupled power supply switching PRU GPIO
BeagleBone Black SDR cape: software-defined receiver (0-30 MHz), web-controlled, ADC + FPGA + GPS
BBB, Arduino UNO 5V interface
Bone Tagzzz is an RFID cape for beagle bone black with Bluetooth Low Energy support for use as a smart, connected RFID sensor.
External Signal Cape - protecting Your vulnerable BBB IO-Ports by level-conversion and protection elements.
Antique Podcast Player
Simple, low cost, SDR and RF instrumentation boards
Affordable plastic BeagleBone Black enclosure
MikroElektronika mikroBus Cape