Flaticon
Free vector icons. Requires attribution, as such: Icons made by [creator] from https://www.flaticon.com/. Find guidelines here: https://support.flaticon.com/hc/en-us/articles/207248209-How-I-must-insert-the-attribution-
Pexels
Free stock photos. Available for commercial and non-commercial reuse. No attribution required.
Pics4Learning
Free copyright friendly images. Available for educational purposes only (no commercial use permitted). Original photographers retain the copyrights to their photos.
Pixabay
Free copyright-free images. Available non-commercial and commercial reuse. No attribution required.
Unsplash
Free images. Available non-commercial and commercial reuse. No attribution required.
These images don't require attribution (giving credit to the creator), but it is appreciated. How would you do it? Here's what Unsplash suggests.
