Wilderdom
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Wilderdom is a site that has been around since 2001 and has more than 2000 game descriptions. Although navigating the site is a bit tricky, games are sorted into 13 categories or can be viewed in one alphabetical mega-list.
"I'd come across and heard about all sorts of fascinating and wonderful ideas for group activities, but when it actually came down to it, locating clear descriptions was rarely easy. After long, often disappointing hours foraging through a variety of books, old program notes, websites, etc. I figured we needed a user-friendly website with clear descriptions of both classic and novel group activities."
If the website is down, you can view an archived version of it at: https://web.archive.org/web/20191101135046/http://wilderdom.com/games/