An easy way to search for typefaces on the web, with direct download, is as follows:
In the search engine type the following: index of : otf
The results shown are .otf font folders used in html pages by thousands of users on the Internet. If you want a specific font just type the name of the font (i.e. index of : SourceSansPro-Light otf).
More:
In the search engine type the following: github otf OR index of: github otf
The results presented are from .otf sources used in projects on the GitHub site