From Paradigmatic Software:
Paradigmatic aims to help you learn and re-learn Biblical verb paradigms, both Hebrew and Greek. Any student of Biblical languages should find this program useful. We will assume a certain level of knowledge of Greek and/or Hebrew - it won't teach you fundamental grammar - but it will help you drill in and learn what you already know.
You can view verb forms by verbal root or irregularity/weakness, use the parsing tool to test your recognition of individual forms, or use the editor to edit existing paradigms or add new ones. A collection of miscellaneous grammar tables are also included for easy reference.