Lexhoard is a dictionary tool for storing words in different languages with the ability to link entries (or 'translate') from one language to others. This php version is a very simple implementation created over a weekend. It can use either a mysql or a sqlite database (other databases may be used, in theory, as all db access is done with PDO).
The medieval glossarium of du Cange (XML+PHP+lucene)
The medieval glossarium of du Cange is a dictionary of medieval languages (mainly, latin, old french, and some greek). This open source project host the XML files, and apps to serve the datas.