Here’s a library submitted by Vanderlei Martinelli called AlecrimCoreData that provides a Swift based wrapper for Core Data inspired by MagicalRecord and Linq.

AlecrimCoreData provides extensive features for fetching, creating, updating and saving entities and allows you to easily fetch and save entities in a background thread if desired.

A nice library for working with Swift in Core Data.

You can find AlecrimCoreData on Github here.