Warden – my open source and cross-platform tool for simplified monitoring (piotrgankiewicz.com)

I wasn't but it's a Ruby library while mine is written in the C#. And the usage seems to be rather different. The name might be ambiguous though.

There are several repositories named "warden" on Github. The Rails gem's name is not unique.

Thanks, seems to be a good idea to try to post it also here!