The paper provides a report on the user-centred showcase prototypes of the DICTA-SIGN project (http://www.dictasign.eu/), an FP7-ICT project which ended in January 2012. DICTA-SIGN researched ways to enable communication between Deaf individuals through the development of human-computer interfaces (HCI) for Deaf users, by means of Sign Language. Emphasis is placed on the Sign-Wiki prototype that demonstrates the potential of sign languages to participate in contemporary Web 2.0 applications where user contributions are editable by an entire community and sign language users can benefit from collaborative editing facilities.