We’ve been using this for awhile as a part of a feature in Kete (an
open source Rails app, http://kete.net.nz) for a content translation
add-on for awhile now. Thought it was about time to share.
From the README:
Rails specific I18n model localization meant to tie-in to existing
ActiveRecord models, ala Globalize2, backed by MongoDB rather than an
RDBMS. May include UI elements, too.