Gravitational Lens Data Base
http://www.cfa.harvard.edu/castles/Homepage of CASTLEs, a gravitational lensing survey based at the Harvard-Smithsonian Center for Astrophysics. The main feature is a data base, complete with images, of all gravitational lens candidates that astronomers have identified so far.
Submitted in section: Physics: Relativity: Gravitational Lensing: Gravitational Lens Data Base