If you are looking for copyright-friendly source materials, we suggest:
- Compfight (searches flickr creative commons)
- Creative Commons Search
- Wikimedia Commons a huge amount of media available for reuse. You can limit searches by adding “.gif”.
- Google Images (with media set for licensed for reuse) You have to click Search Tools and select
Licensed for Reusefrom the
- r/educationalgifs. A frequently updated collection of GIFs that illustrate principles or generally show amazing things.