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Illinois State University: French Literary Tenses
A concise explanation of the French literary tenses with examples and comparisons to spoken language. Has sample conjugations of auxiliary verbs as well as er, ir, re verbs.
Language Guide
Participles
Site discusses formation of present participle and past participle (regular and irregular). Provides Sample phrases in both English and French to illustrate usage. Has a link at the end for interactive practice. Tons of other languages...
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Orthonet Online Grammar Questions
Submit questions relative to grammar, usage/orthography, and receive reply by e-mail.
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Les Nombres Orthographe
Shows the proper way to write numbers orthographically - e.g. 91 = quatre-vingt-onze
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Le Conjugueur: The Conjugator
Great resource that provides full French conjugations of verbs as well as a feature that allows input of an already conjugated verb form and returns the infinitive.
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Orthonet Quick Look Up to Check Orthography
Type in a noun or verb (infinitive only), and site quickly returns info and usage examples. Not a dictionary - provides sample phrases, notes on past participle agreement etc.