When comparing Gliffy Diagrams vs PlantUml, the Slant community recommends PlantUml for most people. In the question“What are the best flowchart / diagram softwares?” PlantUml is ranked 21st while Gliffy Diagrams is ranked 31st. The most important reason people chose PlantUml is:
For example from Emacs, Sublime Text and so on. You can learn about integrations [here](http://plantuml.com/running).
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Similar UX and quality to Visio, but free and online
Pro Supports a lot of different types of diagrams
You can draw:
- Basic drawing
- Flow chart
- UML diagram
- ERD diagram
- Network diagram
- Wire frames & UI Mockup
- Site map
- Business Process Model
- Org chart
- Floor plan
- Venn diagram
- SWOT analyses
- Technical drawing
Pro Many, many integrations
For example from Emacs, Sublime Text and so on. You can learn about integrations here.
Pro Easy create diagrams from text
There is even a Visual Basic Macro to draw UML diagrams in Word.
Pro Free/libre/open source (GPL)
Source code can be browsed here.
Pro Has online editors
Such as.
Pro sphinx-contrib extension for embedding into docs
sphinx-contrib extension on PyPi
Allows you to keep your UML definitions under VCS and include them inside generated documentation with ease.
Cons
Con The "plantUML-language" is a bit strange and hard to grasp for new people
Con Slow development due to it being mostly a one-man project
There’s been no recent contribution to the source forge project but from the administrator arnaud_roques. Future contribution might be difficult due to lacking code documentation.