The Cell: An Image Library is a free collection of images, animations, and videos of cells. The site is easy to search and contains materials from different organisms, showing cell structure, function, and processes.
The collection is a great resource for any teacher or student that is teaching or studying the cell.
The quality of the resources is excellent and this is a resource that Biology teachers are really going to want to check out. Many of the images are microscopic photographs with very high detail and the images are annotated.
You can sign up for a free account if you want to upload images or customize materials.
The entire collection is searchable and you can also browse by subject.