Notable (to me):

Art Crimes https://www.graffiti.org/

Arxiv https://arxiv.org/

Classical Archives https://www.classicalarchives.com/

Principia Cybernetica Web http://pespmc1.vub.ac.be/

San Francisco FogCam https://www.fogcam.org/

The Simpsons Archive https://www.simpsonsarchive.com/