I often look for similar sites when I am searching for affiliate programs to promote, so I can get the best commission, and compare other elements of the affiliate programs.
Typically, I use Google to search out sites, but I came across SimilarSites.com, which makes the process more efficient, since it enables me to enter a domain and get results of similar sites.
The queries are not limited to searching the domains themselves. For instance, I searched the URL for the Amazon affiliate program, and the results included CJ.com, ClickBank, LinkShare, eBay Partner Network, AzoogleAds, ShareASale, and Google AdSense.
This could be a good tool for affiliate managers to find similar niche sites, too.
And if you’re using Google Chrome, there is a Similar Sites add-on.
Check out Similar Sites.