OpenCV Official OpenCV website in Chinese language. OpenCV is a useful library for image processing and computer vision.
Glut Latest glut binaries and source code. If you have difficulty accessing their website, you can also download the binaries here.
CMU CV Group The website of the former CMU Computer Vision Group. Contains some interesting demos and data for comparisons.
Oxford Active Vision Group There are several significant and interesting computer vision research conducted by this group. If you are interested in SLAM, perhaps you should look at George Klein's home page.