Amazon.com: Expansion Board Cape Module Supports Beaglebone Black Features Miscellaneous Components and Functions (Buzzer/ RTC/ DEBUG ONE-WIRE interfaces) @XYGStudy: Computers & Accessories
BeagleAlexa - Hackster.io
Beagleboard:BeagleBone Capes - eLinux.org
Grove Base Cape for Beaglebone v2.0, Compatible with beaglebone V2.0, Provides up to 12 Grove ports, Changeable I2C address, Various interfaces include 2 UART, 4 I2C, 2 analog out and 4 digital
Beagleboard:BeagleBone Capes - eLinux.org
SparkFun BeagleBone Black Proto Cape - DEV-12774 - SparkFun Electronics
Amazon.com: Coolgear BeagleBone Black USB Expansion RS232 Module Cape: Computers & Accessories
Adding CAN to the BeagleBone (Black) – Beyondlogic