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blockdiag

blockdiag and its family generate diagram images from simply text file. Features:

18 Alternatives To blockdiag

CollabNet

ArgoUML, free and safe download. ArgoUML latest version: Open-source diagramming application for personal computers. ArgoUML is a program that allows users to create complex and professional diagrams.

Dia

Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
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Diagrammix

Tool for efficiently building attractive diagrams.

Gaphor

Gaphor is a Python-based, open source, multiplatform and multipurpose modeling application for creating nice UML diagrams for documentation.
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Gephi

Gephi is an open-source software for visualizing and analyzing large networks graphs.
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Grapholite

Powerful Windows 10, iPad, Android and Desktop solution for the creation of flowcharts, org charts, floor plans, uml diagrams, bpmn diagrams, mind maps, venn charts, web site structures and wireframes, network layouts etc.

Graphviz

Graphviz is open source graph visualization software. It has several main graph layout programs.
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LucidChart

LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

PlantText

PlantText is an online tool that quickly generates images from text. Primarily, it is used to generate UML (Unified Modeling Language) diagrams. It is based on a text language called PlantUML.

PlantUML

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

Polinode

Polinode is a tool that makes it easy to perform powerful network analysis.

Software Ideas Modeler

Lightweight, powerful, easy to use, UML tool
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StarUML

StarUML

UMLGraph

UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
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UMLet

UMLet - Free UML Tool for Fast UML Diagrams

Umbrello

Umbrello UML Modeller is a Unified Modelling Language diagram programme for KDE.
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yEd Graph Editor

yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.