I have developed a tool, named CasSys, permitting to work on cascades of transducers. This tool is implemented in the Unitex text processing system with an IDE but also in command line (windows/linux/macOS). The source code is also available in LGPL Licence. CasSys allow to apply cascades of transducers on texts to do syntactic analysis, chunking, named entities recognition (NER) etc. using a very friendly interface to edit the cascade and the transducers.