Online tutorials are great opportunities for students to create presentations for an authentic audience (see The Best Places Where Students Can Create Online Learning/Teaching Objects For An “Authentic Audience”).
Obviously, anyone can create tutorial and put it online.
However, this list contains some easy and scaffolded tools for creating them, which will also automatically be made available to a broader audience:
Stonly lets you create interactive “guides.”
Iorad is a Chrome Extension that lets you easily create tutorials. Here’s a video about it: