Best Flow Charts And Diagrams in 2025

Online diagramming application

Open Source

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

Open Source

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.

Create diagrams and visualizations using text and code.

Open Source

Simplify and communicate complex information using data-linked diagrams.

Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.

Open Source freemium $7.0 / Monthly

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

Free database diagrams designer for analysts & developers 🛠

Diagrams lets you draw the cloud system architecture in Python code. It was born for prototyping a new system architecture without any design tools. You can also describe or visualize the existing system architecture as well.

Open Source

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.

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

StarUML

An open-source tool for generating flowcharts from text

Open Source