Bookworm – Search for trends in 4.6M public domain texts from HathiTrust Digital Library
Delicious – social bookmarking
Diigo – social bookmarking
Hypothes.is – annotate online texts privately in class or publicly
JSTOR Labs Text Analyzer – Use your own document to search for articles and books
Mendeley – free reference manager and an academic social network.
NGram Viewer – tool that searches Google Books for word frequency
Voyant – Digital text mining tool
Zotero – collect, organize, cite, sync, and collaborate