another ActiveRecord versioning plugin.

"vestal_versions keeps in the spirit of consolidating to one versions table, polymorphically associated with its parent models. But it goes one step further by storing a serialized hash of only the models’ changes. Think modern version control systems. By traversing the record of changes, the models can be reverted to any point in time.

And that’s just what vestal_versions does. Not only can a model be reverted to a previous version number but also to a date or time!"

"acts_as_revisable enables revision tracking, querying, reverting and branching of ActiveRecord models. It does this while providing more Rails-like API than similar plugins. This includes extensions of standard ActiveRecord methods and numerous custom callbacks for the entire AAR life-cycle."

auto versioning / auditing for activerecord models

"acts_as_audited is an Active Record plugin that logs all modifications to your models in an audits table. It uses a polymorphic association to store an audit record for any of the model objects that you wish to have audited. The audit log stores the model that the change was on, the “action” (create, update, destroy), a serialzied hash of the changes, and optionally the user that performed the action." - this might have to replace acts_as_versioned + riff in an app I'm writing right now

plugin to auto-version active record text/string fields to a git repository for easy history versioning and rollback