TheRenamer - Automatically rename and organize your TV shows and Movies. Also moves them to your Media Library!
Bulk Rename Utility - Bulk Rename Utility: Free File Rename Utility for Windows. Bulk Rename Utility allows you to easily batch rename files and folders based upon many flexible criteria. Free Download.
tinyMediaManager - A multi OS media manager written in Java/Swing
Ant Renamer - Ant Renamer can rename large amounts of files and folders in few clicks.
FileBot - FileBot is the ultimate tool for organizing and renaming your Movies, TV Shows and Anime as well as fetching subtitles and artwork. It's smart and just works.
Advanced Renamer - Video files.