SDict Viewer is a viewer for dictionaries in open format developed by AXMASoft (free dictionaries are available for download at http://sdict.com). Primary goal of the project is to provide usable dictionary app for Nokia Internet Tablets running Maemo.
VerbOS allows viewing, searching, editing and testing of verb conjugations. There are around 8000 French verbs, 10000 Spanish verbs and 4000 Portuguese verbs. Additonally dict.dz dictionaries can be loaded into the dictionary interface.
Palabra is an extensible dictionary written in Perl using a MySQL database for linguistic information. It is designed to be used with any number of languages with links to translations. Check out the source code using CVS or browse the CVS Repository.