Football Federation Australia has online training sessions for all ages.
Football South Coast has an online Coaching Handbook for coaching players aged 5-9 years old
Football South Coast has an online Coaching Handbook for coaching players aged 9-13 years old
Better Soccer Coaching offers skills, drills, tips and advice on coaching as well as free e-books and a magazine, Soccer Coach Weekly, you can subscribe to.
World Class Coaching has free e-books and articles on tactics and training drills, as well videos and books to buy. You can sign up for a free weekly newsletter.
Footy4Kids is a UK-based website with free articles, tips and session plans for coaching junior teams.