[Blind-sysadmins] accessible uml editors

Hi. On a server, what accessible uml editors would you use. Need to use a uml editor for an assignment. And this is a core subject, lectuer cannot change this. Need to do a state, use, case, sequence diagrams, for a couple of projects, a c # and a sql server project. Have googled and looked all over the place. So any ideas. Marvin.