OpenMV (Open Machine Vision Module)
OpenMV is an open-source tiny machine vision module based on the STM32F4xx ARM Cortex-M4 MCU and the OV2640 JPEG sensor.
OpenMV is programmable in Python3 (MicroPython) and capable of doing face detection and tracking, keypoint extraction, color tracking and more..The board has USB, a uSD connector and an expansion header (USART/SPI/I2C).
A Python IDE with syntax highlighting is available for the camera, it can run/upload scripts to the camera, view the framebuffer and update the firmware.
This is a video of the color tracking:
This is a video of the face detection: