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When comparing Dia vs ThinkComposer, the Slant community recommends Dia for most people. In the question“What are the best flowchart / diagram softwares?” Dia is ranked 13th while ThinkComposer is ranked 22nd. The most important reason people chose Dia is:
Has flowcharts, uml, chemical engineering, electronics, and dozens of other complete sets, built in.
Specs
Question Ranking
Pros
Pro Tons of icon sets
Has flowcharts, uml, chemical engineering, electronics, and dozens of other complete sets, built in.
Pro Free and open source
Pro Custom gzipped XML format
Pro Multilevel
Diagrams can be multilevel, this means that they can have nested diagrams within them.
Pro Open source
Licensed under the terms of the GNU General Public License v3.
Pro Tables
Tables can be populated from CSV files.
Cons
Con Unmaintained
Dia has not been updated since 2009. It's already a very complete piece of software, but still sad.
Con UX is a joke
UX is not good enough. For example, to edit element text you must double-click it, then click text box, and then you can start typing text.
