Dia About Us › Forums › OSS Products Discussion › Diagramming › Dia › Dia Tagged: Dia, Visio This topic has 0 replies, 1 voice, and was last updated 1 year, 11 months ago by Karel Joubert. Viewing 0 reply threads Author Posts 11th Nov 2019 at 8:19 pm #2367 Karel JoubertParticipant Dia is free and open source general-purpose diagramming software. It is released under GPL and can be installed on Windows, OS X and Linux. It can open several document formats like dxf, svg and vdx but is not directly compatible with Visio. Author Posts Viewing 0 reply threads The forum ‘Dia’ is closed to new topics and replies.