Perseus Digital Library (all of our classical texts, dictionaries, etc.) – http://www.perseus.tufts.edu/
Whitaker’s Words (very useful parsing dictionary) – http://archives.nd.edu/words.html
Perseus Edition of the Pro Caelio – http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.02.0010:text=Cael.
Allen and Greenough’s Latin Grammar (the best Latin reference grammar available) – http://rossviewlatin.weebly.com/uploads/1/2/7/8/12787698/allen_and_greenough_s_new_latin_grammar.pdf
