https://doc.tiki.org/Federated+Search
https://tiki.org/Use+Cases+for+NLP+and+IR+in+Tiki
See also: http://larsjung.de/h5ai/ or http://elfinder.org/
https://github.com/dadoonet/fscrawler
File managers: https://github.com/search?o=desc&q=filemanager&s=stars&type=Repositories