HexaPDF is a pure Ruby library with an accompanying application for working with PDF files. It was designed with ease of use and performance in mind. It uses lazy loading and lazy computing when possible and tries to produce small PDF files by default.
Convert copy. Pipes existing converter tools together to convert files from a format to another.
E.g. add the converters 'pdf -> text' and 'text -> wav' and you can convert pdf to wav.
Automatically installs missing converters in Debian.