"With MARKUS you can upload a file in classical Chinese (and perhaps in the future other languages) and tag personal names, place names, temporal references, and bureaucratic offices automatically. You can also upload your own list of key terms for automated tagging. You can then read a document while checking a range of reference works at the same time, or compare passages in which the same names or keywords appear." Check its research blog examples of how the data extracted from this tool is used.
Voyant Tools is a web-based reading and analysis environment for digital texts. Generate world clouds, world frequency lists, word usage visualizations, etc.