the C book | C Programming notes | Mikroe C book

embedded.fm | Ganssle Group | Barr Group | Udemy

Microchip

MPLAB Xpress IDE

Fundamentals of the C Programming Language- online tutorial

MikroE projects and tutorials

Codepad

AVR Freaks online C books & Tutorials |

Accurate 1-second periods with any xtal
Finite State Machine Basics

CRC Generating and Checking

Piclist
Interfacing to analog sensors

Linux

http://freedompenguin.com/

https://www.raspberrypi.org/

Python

Micropython

automate the boring stuff.com

dive into python 3

Writing Idiomatic Python

PyRegEx regex testing

Another regex tester

Regexr.com

d.bader.org