Github server gem as authorname-projectname so duplicate of same project should be removed from this counting.
That will give actual number
18 webrat
18 will_paginate
20 god
29 rack
30 sinatra
31 twitter
33 integrity
37 merb
48 dm
71 ruby
gem list -r -s http://gems.github.com | cut -d- -f 2 | cut -d " " -f 1 | sort | uniq -c | sort -n | tail -10Gem publishing is opt-in. Even for forks.