Learn the Language
Ancien français: vocabulaire et morphologie (in French)
Dictionnaires des verbes de l’ancien français: structure et méthode
Grammaire française
Grammar and Drills
Grammaire française: Exercices
Online Dictionaries
Anglo-Norman Dictionary
Old French Lexicon (in French, by Douglas C. Walker)
Old French Online Master Glossary (by Jonathan Slocum and Brigitte L.M. Bauer)
Texts and Readings
Anglo-Norman Source Texts
ARTFL Project: French Literature
French Medieval Drama Database Project
In Parentheses Old French Series
Internet Medieval Sourcebook: French Medieval Texts
Princeton Charrette Project
Other
Old French Insults (by Gillian Potlack)