In application debugger for ARM Cortex microcontrollers.
FemtoUSB - ATMEL ARM Cortex M0+ (SAMD21), 256KB @ 48MHz, 3V3
The Core is highly configurable, straightforward C++ embedded framework with minimum set of development dependencies.
OmniAuth strategy for Cortex's OAuth 2.0 implementation
An HTTP & WebSocket server for cortex
Cortex on steroids: for larger populations with better assembly