Parse text into parts of speech, or simply recognise their language or script. Analyse the frequency of words in a text, with an option to do this by word roots (lemmas).
Finishing off some of the details in this unique app which analyses text in many different languages. And a decidedly naughty Rich Text editor which lets you set appearance for each of its windows.
Want to analyse Trump’s speeches? Can I suggest a concordancer, such as one of those detailed here?
Celebrating the bicentenaries of Charles Dickens and Henry Mayhew with a couple of concordance tools.