UMLet is an open-source UML tool with a simple user interface: draw UML diagrams fast, export diagrams to eps, pdf, jpg, svg, and clipboard, share diagrams using Eclipse, and create new, custom UML elements.
UMLet is a UML tool aimed at providing a fast way of creating UML diagrams. UML elements are modified using text input instead of pop-up dialogs. Elements can be modified and used as templates; this way, users can easily tailor UMLet to their modeling needs. UMLet supports a variety of UML diagram types: class diagrams, use case diagrams, sequence diagrams, state diagrams, deployment diagrams, activity diagrams
blockdiag and its family generate diagram images from simply text file.
Supports many types of diagrams
block diagram (w/ blockdiag)
sequence diagram (w/ seqdiag)
activity diagram (w/ actdiag)
logical network diagram (w/ nwdiag)
Generates beautiful diagram images from simple text format (similar to Graphviz ’s DOT format)
Layouts diagram elements automatically
Embeds to many documentations; Sphinx, Trac, Redmine and some wikis
Powerful vector graphics editor for the office with tools for easily creating charts, diagrams, brochures and more.
diagrams.net (previously draw.io) is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams. No login or registration are required and features include the ability to save locally (including SVG), a range of stencils, .vsdx, Lucidchart and Gliffy import and real time diagram sharing.
Extensible, multi-platform mind mapping creation, analysis and presentation software.
Dia is a GTK+ based diagram creation program for Linux, Unix, Mac OS X and Windows released under the GPL license.
Dia is roughly inspired by the commercial Windows program Microsoft Office Visio, though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.
An easy tool for generating diagrams and flowcharts from text in a similar manner as markdown.
Open-source, Java-based UML diagram maker using plain text descriptions to draw models.
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