There are several good resource sites for the world’s (and Canada’s) mountains:

Peakbagger.com The goal of this web page is to host the most comprehensive collection of peak lists in the world.

Peaklist.org This website is designed to provide definitive lists of summits organized around the concept of topographic prominence.  Peaklist does not attempt to list every mountain in the world; rather it introduces original and complete research in specific geographical regions, contributed by a wide number of researchers.

Bivouac.com  Encyclopedia of Canadian mountains.  It is run by members who are hikers and climbers who do a terrific job in building perhaps the best encyclopedia of mountains available for Canada. Membership costs $25 per year.