Quoting "John W. Long" <ng / johnwlong.com>:

I think they merged their project with Ruby Facets  
(http://facets.rubyforge.org/)

> Whatever happened to the Calibre project?
>
> It seems that there are a few gems that are remnants of the project
> (gem search --remote calibre), but I can't locate a related Web site.
>
> There doesn't even appear to be a project for it on RubyForge anymore:
>
> http://calibre.rubyforge.com
>
> Has it been renamed?
>
> --
> John Long
> http://wiseheartdesign.com
> http://radiantcms.org