The purpose of this post is primarily to give me a place to add resources as I find them from time to time.
Dictionaries & Lexicons
lexilogos.com/english/latin_dictionary.ht This site has several links to dictionaries including Perseus.
online-latin-dictionary.com This is an excellent dictionary. Not only will it find Latin forms, it will give you a link that allows you to see the full paradigms and declensions for the word you’ve searched.
Aquinas.cc – The Aquinas Institute has been working on new translations of Aqinas’s works. They have put online a side by side Latin/English parallel of their translation. They’ve done most of the Summa, Contra Gentiles, and other works.