Lex is an efficient language learning tool for working on authentic material on the web. With Lex you can easily look up words, listen to pronunciations, highlight words and make your own gap filling exercises. Lex uses various sites on the Web to look up words in both bilingual and monolingual dictionaries. As part of the look up process you can build up your own glossary, which later on can be used to make glossary exercises.

Txt2regex is a Regular Expression wizard that converts human sentences to regexes. In a simple interactive interface, you just answer to questions and build your own regex for a large variety of softwares and programming languages: AWK, ed, egrep, Emacs, expect, find, gawk, grep, lex, lisp, mawk, MySQL, OpenOffice.org, Perl, PHP, Postgres, Procmail, Python, SED, Tcl, VBscript, VI, Vim. Translated to 10 languages, it also supports POSIX classes.