The SSiiggnnWWrritiitinngg system is a writing system for deaf sign languages. SSWWMMLL (SignWriting Markup Language) is an XML-based format that we are developing for the storage and processing of SignWriting texts and dictionaries, allowing the interoperability of SignWriting savvy applications and promoting web accessibility to deaf people in their own natural languages. This paper presents the SignWriting system and reports on the state of the work being done on the development of SSWWMMLL and SignWriting-based web applications using SWML to render sign languages.