Although research tells us that open content is hard to find, there is a growing number of repositories and search engines to help you locate what you need.
Here are some suggestions:
OER Commons contains 50,000 learning materials in a variety of
subjects ranging from preschool to adult education
OpenLearn is the home of free learning materials from The Open
University
OpenStax CNX offers thousands of textbook-style resources in a
host of disciplines that can be viewed, downloaded, adapted and
shared
PhET is a collection of free interactive simulations for Math
and Science from the University of Colorado
Open Education Europa contains a very useful list of European repositories of OER classified by country, language and subject among other categories.
If you are looking for images, Photos for Class allows you to directly search properly attributed, Creative Commons, age-appropriate images from Flickr;
Unsplash contains photos licensed Creative Commons Zero, and Pixabay gives you access to hundreds of thousands of public domain images, including vectors and art illustrations.
What websites would you recommend to other course participants? Help us crowdsource a list of must-go online places: add at least one link to your preferred repositories/sites in the forum below. Ask your colleagues at work to give you a hand.