Basic Resources

World Shakespeare Bibliography Online: 

http://www.worldshakesbib.org/

Internet Shakespeare Editons. Editions of the Plays and many resources:

http://internetshakespeare.uvic.ca/

Visualizing English print: 

http://winedarksea.org/?p=1799

Oxford English Dictionary: 

https://library.umaine.edu/auth/auth.asp

Lexicon of Early Modern English:

http://leme.library.utoronto.ca/

good online editions:
http://www.folgerdigitaltexts.org/

open source shakespeare

http://www.opensourceshakespeare.org/

Britannica's guide to Shakespeare: 

http://www.britannica.com/shakespeare