Image browsers/Metadata editors
Mac & PC support.
"AVI MetaEdit supports embedding and validating metadata in RIFF-based Audiovisual Interleave format (AVI) video files."
BreezeBrowser (Breeze Systems)
PC support only.
"BWF MetaEdit is a free, open source application that supports embedding, validating, and exporting of metadata in Broadcast WAVE Format (BWF) files."
Image Info Toolkit is an easy to use application that handles the textual information (also known as IPTC-information fields or XMP - meta info) within JPEG-, TIFF- and DNG - image files. It enables you to read and write image information like caption, copyright, date, etc. to a jpeg file without the need to compress the file again. Mac & PC support.
PC support only.
Metadata Quality Control (AVP)
"MDQC is a free and open source application that allows users to create rules on embedded metadata, scan a set of files, and report on the conformance of each file against the user-defined rules."
Mac & PC support. This tool is in development, with the promise of image cataloging functionality!