Swimlanes.io is described as 'Simple free online tool for making sequence diagrams' and is an website. There are five alternatives to Swimlanes.io, not only websites but also apps for Mac, Windows, Linux and Self-Hosted. The best Swimlanes.io alternative is StarUML. It's not free, so if you're looking for a free alternative, you could try Colibri Diagrams or SequenceDiagram.org. Other great sites and apps similar to Swimlanes.io are js-sequence-diagrams and WebSequenceDiagrams.
StarUML is a program to develop fast, flexible, extensible, featureful, and freely-available UML/MDA platform running on Win32 platform. The goal of the StarUML project is to build a software modeling tool and also platform that is a compelling replacement of commercial UML...
Sequence diagrams are a great way to visualize the flow of a system. But making them beautiful and presentable is not easy.
Free Sequence Diagram Tool Online. Clean simple interface and fast client side processing. Works Online and Offline, Scripting and Drag and Drop.
A simple JavaScript library to turn text into vector UML sequence diagrams. Heavily inspired by websequencediagrams.com, who offer a server-side solution. js-sequence-diagrams uses Jison to parse the text, and Snap.svg to draw the image.
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