University of Texas at Austin
Tex's French Grammar: Contractions of a and De
This lesson from Tex's French Grammar is a wonderful site with clear explanation of forming conntractions with the prepositions "a" and "de", with written and audio usage examples and interactive practice exercises.
Other
Les Jeux D'orthonet: Interactive French Grammar Exercises
These multilevel French grammar interactive exercises concentrate on agreement of past participles and the like.
Other
City College, San Francisco: French Online Grammar Quiz
Series of interactive online grammar quizzes divided into 12 chapters (intended to accompany text "Allons-y" but text not necessary). Each chapter is divided into various concepts and provides a short, self-correcting test - several in...
University of Texas at Austin
University of Texas: Francais Interactif
This full-featured interactive textbook encounter utilizes French speakers in real life scenarios. Well structured for work on grammatical concepts (links to Tex's French Grammar), vocabulary, listening comprehension and exposure to...