Dia

Dia has somewhat stagnated in recent years. For a long time it was the only real open source option other than turning to Inkscape and doing everything from scratch. These days I'd recommend you try Pencil instead because it has a much nicer UI and arguably better features.

Can not dl because source forge certificate is out of date.

[Edited by dimlakgorkehgz, March 28]

OOps that is just because I was downloading it from KFC.

Lightweight, Easy to use, Nearly no Bugs, Compatibility

Like that software. It's a bit unhandy sometimes but in the end maybe the best libre software there is for that purpose.

• Complete Component but hard to use - file export are 1 by 1 (cant bulk)

I successfully made some diagrams with Dia but, as another user said, its interface is really clunky. Now I'm trying yED.

Dia on Linux - shines.

I was able to use it to create all sorts of logic diagrams - for programming and for organization. It is also capable to unite any elements and group and supports layering. Perfect software!

I don't like Dia on mac - requires extra install and does not comply with standard mac application behavior.

For open source diagraming on mac I'd say LibreOffice - Draw is a better choice.

Dia is a piece of crap. Don't use it, unless you're a martian (because it designed for martians).

If it had an import filter for visio files it would be perfect.

I use it and like it but find the interface to be clunky. For any serious diagramming I'd still opt to use Visio (unfortunately).

Easy flowchart program that is free. Has many features found in Visio. Probably not a complete replacement for Visio but adequate for many uses.

Dia is a very good alternative if you are looking for a free easy to use flow chart app.