Allen and Greenough's New Latin Grammar - A light, self-contained version of the classic grammar. Some parts are missing. www.hhhh.org/perseant/libellus/aides/allgre/allgre.contents.html
Allen and Greenough's New Latin Grammar for School and Colleges - One of the classic Latin grammar books, online. This version is housed by the Perseus project and has cross-references to other sections of Perseus. www.perseus.tufts.edu/cgi-bin/ptext?doc=Perseus%3Atext%3A1999.04.0001
Collection of Grammars - Descriptive, historical and alternative grammars. Also has historical and general information about Latin. www.orbilat.com/Latin/index.html
Grammar at About.com - Resources to learn the rules behind the Latin language, the formation of word endings, how words are strung together in a sentence, the grammar. Local articles and links to other sites. ancienthistory.miningco.com/cs/latingrammar
Grammatical Aid - Helps remember grammar by turning the grammatical rules into little songs. www.shsd.org/Latinrev/grammar.htm
Inflected Latin - Tables of all of the declinations and conjugations, as well as some irregular inflections. www.geocities.com/Athens/Forum/6946/inflections.html
Latin Glossary of Terms - Explanations of Latin grammar terms. www.colorado.edu/Classics/Latin/glossary.html