I just discovered this nice blog devoted to chess engines. LINK
The author’s stated purpose is to: present the results of his testing and experiments with computer chess engines, as well as to provide information to others concerning engines, GUIs, and ancillary programs. The blog contains links to engine downloads, forums, GUI’s, rating lists and utility programs.
One thing that might appeal to lower rated players is his rating list of “Also Ran” engines. These are weaker engines that have not been tested on most lists because they are too weak.