ANTLR (ANother Tool for Language Recognition) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing C++, Java, or Sather actions. It is similar to the popular compiler generator YACC, however ANTLR is much more powerful and easy to use. ANTLR-produced parsers are not only highly efficient, but are both human-readable and human-debuggable (especially with the interactive ParseView debugging tool). ANTLR can generate parsers, lexers, and tree-parsers in either C++, Java, or Sather. ANTLR is currently written in Java.
BRL-CAD is a powerful constructive solid geometry solid modeling system that includes an interactive geometry editor, ray-tracing support for rendering and geometric analysis, path-tracing for realistic image synthesis, network distributed framebuffer support, and image and signal-processing tools.
Flex is a tool for generating programs that recognize lexical patterns in text. There are many applications for Flex, including writing compilers in conjunction with GNU Bison. Flex is a free implementation of the well known Lex program. It features a Lex compatibility mode, and also provides several new features such as exclusive start conditions.
HTML Forms generation and validation is a PHP class that generates HTML forms supporting many built-in validation types on server and client sides. It prevents security attacks by discarding spoofed values, has multiple submit protection, outputs HTML for fields displayed as fully accessible or in read-only mode, and has field value filtering and reformatting. It can be extended with custom control plug-ins. AJAX based form submission, upload monitor progress bar, auto-complete text input, automatic layout renderer, calendar date, CAPTCHA, Google Maps world location selection, linked select, and animation effects plug-ins are available.