Hi,

Are there any free bug/issue trackers written in Ruby?

For comparison, Python has at least two really nice ones (trac and roundup):

http://www.edgewall.com/trac/
http://roundup.sourceforge.net/

Even rubyonrails is using an issue-tracker written in Python (trac).
http://dev.rubyonrails.org/trac.cgi/wiki