Python Playground
Geeky Projects for the Curious Programmer
Django 2 by Example
Antonio Mele
Assembly Language Step-by-Step
Jeff Duntemann
Python for Informatics
Charles Severance
Introduction to Sociology 2e
Heather Griffiths & Nathan Keirns & Gail Scaramuzzo & Susan Cody-Rydzewski & Eric Strayer & Sally Vyrain