Bluetooth Low Energy

Internet draft describing CoAP-over-GATT. See https://gitlab.com/chrysn/coap-gatt-demo for a demo.

export USB hid over BLE to multiple hosts, and select the active host using hotkey combination

Build your own crank-based power-meter for (indoor) cycling

Casio F91 smart watch reboot.

A simple bluetooth low energy client application based on Qt.

a software module for continuous high-rate RSSI sampling on standard low-power wireless nodes (1 Msps on nRF52840 devices in BLE mode)

An android remote

STM32 beacon project source code with support for Eddystone and i Beacon

https://mojipic.co/

A Bluetooth Low Energy inspector for the command line.