I had been looking for free software that would allow me to draw lovely diagrams and flow chart type things, to aid me in my software and project planning adventures. Well I found something that is usable. It’s called Dia.
Dia is “A program for drawing structured diagrams.” Its open source, which is awesome. It could do a better job at anti-aliasing.. but otherwise it’s quite impressive. Now I have no idea what a diagram drawing application, at it’s best, can be. That is to say I have never used Microsoft Visio. So my views may be slightly primitive. Dia does seem to do what I need it to though, I can edit the squares and arrows and stuff all I need to, draw custom shapes and draw nice curving arrows too! There are tons of other diagram sheets, for making all kinds of diagrams!
Anyway, if you are looking for a nice diagram application that is free try out Dia
Screenshot of Dia from dia.installer.de