DropGlot

AppleGlot is the only mac-specific incremental localization tool which is directly supported by Apple.

Not only that, it's free and comes with dictionaries full of the official translations sanctioned by Apple. AppleGlot, however, is designed to be part of a high volume localisation process. As a result, it can be cumbersome to use for smaller projects. Drag and drop a file or bundle on DropGlot and it will automatically build an AppleGlot environment, populate it, trigger an initial pass and open the resulting WorkGlossary - taking the hassle out of using AppleGlot with individual products. Drop both old and new versions of the same bundle on DropGlot and it will automatically build the environment and populate it so that as much information as possible will be pulled from the older version. When DropGlot receives a WorkGlossary file, it checks to see if it is part of an AppleGlot environment. If it is, DropGlot triggers an incremental pass in AppleGlot and automatically opens the new WorkGlossary ready for you to continue working.