Fast Architect helps you create diagrams by using simple intuitive syntax whether you are a developer, an analyst or an architect.
Fast Architect automatically builds a library of components you are using in the diagrams.
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Easy and fast way to create diagrams using custom syntax. Has all the features I need with many different diagram types built in. Contains some interesting features to track your architecture and make it easy to browse.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
WebSequenceDiagrams - WebSequenceDiagrams is a web-based application that allows the user to use a proprietary language to define sequence diagram.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
draw.io - Online diagramming application
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.