I use AVR, STM32, TI microcontrollers in my research and personal projects. Here is the collection of PCB boards that I designed for control, signal processing, communication, etc.
PCB Design
Development Module
Development Board for TI C2000 Real-time Microcontrollers
Development Board for STM32 Microcontrollers
PCB Design Website
PCB Trace Width Calculator
FREE PCB File Check
Saturn PCB Design Toolkit