The diction Install diction package contains a tool called style, which analyses the surface characteristics of the writing style of a document. It prints various readability grades, length of words, sentences and paragraphs. It can further locate sentences with certain characteristics.
CTparental is a free and open-source parental control tool used to control computer usage or internet browsing. It comes with a simple and easy-to-use web interface powered by a Lighttpd web server. The idea of CTparental tool comes from other tools such as, iptables, dnsmasq, and inguardian privoxy.
V. Bozhikova, and M. Stoeva. Proceedings of the 11th International Conference on Computer Systems and Technologies and Workshop for PhD Students in Computing on International Conference on Computer Systems and Technologies, page 119--124. New York, NY, USA, ACM, (2010)