VerbOS allows viewing, searching, editing, and testing of verb conjugations. Currently there are verb packs for nearly 8000 French verbs, 10000 Spanish verbs and 4000 Portuguese verbs.
Additionally, you can use VerbOS as a front-end to view dictionaries in the dict.dz format. Normal search and display functions are fully supported.
You'll need to have a Java Runtime Environment to use VerbOS.