GpsPhoto.pl geotags digital photos by using GPS track data recorded at the same time. Matches are based on closest timestamps. An optionally generated Google Earth KML or KMZ file contains the GPS tracks and the geotagged photos.
Image Tagger is a simple graphical application to allow the tagging of images. It currently allows you to set title, commands, and keywords in the IPTC / EXIF tags. It's not very polished, but it is pretty stable. It uses ExifTool for editing tags.
Generate image galleries quickly and easily, with no need to regenerate the entire gallery every time you change the look and feel. No need for a database! Just add AxKit, and some images in a directory hierarchy.