1. Pixabay – Recently I had to write a test for an online test preparation publishing company, and I needed to include various images to go along with some of the test questions. Of course, those images had to be in the public domain, and it is sometimes difficult to determine if an image is in the public domain. Pixabay is a free image search site that offers images in the public domain. The image of the cup of coffee above was taken from Pixabay. FREE.
2. Coggle – Coggle allows users to easily create mind maps or webs. There’s not a ton of features to the site, and it is in its beta phase, but it is very simple to use. Coggle could be good for brainstorming sessions, pre-writing exercises, review purposes, etc. FREE.
3. Opus – Opus is a free, searchable database of middle school math problems aligned to the common core. FREE.