📈 Flow Charts And Diagrams

The C4 model for visualising software architecture. Context, Containers, Components, and Code.

Open Source

WebSequenceDiagrams is a web-based application that allows the user to use a proprietary language to define sequence diagram.

Creates diagrams from textual descriptions! It provides a unified API with support for BlockDiag, BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, GraphViz, Mermaid, Nomnoml, PlantUML, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom

Open Source

Create professional charts and diagrams easily, quickly and collaboratively. Visual Paradigm Online is an all-in-one online diagram software that lets you create UML, BPMN, ERD, DFD, Org Charts, Mind Map, charts, infographic.

Swimlanes.io is a simple free online tool for making sequence diagrams.

Enterprise Architect - UML Design Tools and UML CASE tools for software development | Sparx Systems

js-sequence-diagrams turns text into UML sequence diagrams.

Clean and fast online sequence diagram tool using scripting and Drag and Drop

Draw, LibreOffice, ODF, open standards, creative software, vector drawing

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

UMLet - Free UML Tool for Fast UML Diagrams

Java command-line tool to convert ASCII diagrams to bitmaps.

An easy solution to create product flows.