Diagramming

Flowcharts, architecture diagrams and org charts.

Free plan Open source

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51 products

Apache OpenOffice
Free
The Free and Open Productivity Suite
Free planOpen source
GeoGebra
Free
Free digital tools for class activities, graphing, geometry, collaborative whiteboard and
Free planOpen source
draw.io
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Diagram software for flowcharts, org charts, UML, ER, and network diagrams
Free planOpen source
Doxygen
Free
Code Documentation. Automated.
Free planOpen source
draw.io
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Free diagramming application with over 100 million users. Your data, your control.
Free planOpen source
QuickChart
$40/mo
Generate chart images through a single API call for embedding anywhere.
Free planOpen source
HedgeDoc
Free
Ideas grow better together
Free planOpen source
Gephi
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The Open Graph Viz Platform
Free planOpen source
RPTools
Free
100% free, community driven Role Playing Tools.
Free planOpen source
Freeplane
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Free and open source application for creating and navigating mind maps.
Free planOpen source
Eraser
$15/mo
AI for diagrams that matter
Free planOpen source
Orange Data Mining
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Data mining: fruitful and fun.
Free planOpen source
MyTourbook
Free
Visualize and analyze recorded tours
Free planOpen source
RAWGraphs
Free
A free and open source tool for data visualization
Free planOpen source
SQLeo Visual Query Builder
Free
A SQL tool that turns complex queries into diagrams and provides a graphical query builder
Free planOpen source
Insight Maker
Free
Build simulations and models for free
Free planOpen source
WiseMapping
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Free and open-source mind mapping.
Free planOpen source
La Digitale
Free
Free digital tools for teachers and educators.
Free planOpen source
GNU TeXmacs
Free
A free scientific text editor for creating technical documents with mathematical typeset
Free planOpen source
LogicCircuit
Free
Educational software for designing and simulating digital logic circuits
Free planOpen source
uMap
Free
Online map creator.
Free planOpen source
Ambiera e.U. Software Development
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Software for creative people
Free planOpen source
Docmost
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Enterprise-ready Wiki for Teams
Free planOpen source
WBO
Free
Collaborative whiteboard
Free planOpen source
Pencil Project
Free
An open-source GUI prototyping tool that's available for ALL platforms.
Free planOpen source
Arguman
Free
Argument analysis platform for mapping premises, supports, and objections.
Free planOpen source
Neverkin
Free
A worldbuilding platform for organizing notes, stories and campaign material.
Free planOpen source
Visprex
Free
Visualise your CSV files in seconds without sending your data anywhere
Free planOpen source
Nimbalyst
$20/mo
Visual editor for Claude Code and Codex (open source).
Free planOpen source
TSP Visualizer
Free
Interactive solver for the traveling salesman problem to visualize different algorithms.
Free planOpen source
Keyboard Simulator
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Design and test virtual keyboards
Free planOpen source
D2 (D2Lang)
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A modern language that turns text to diagrams
Free planOpen source
Rocky Li
Free
Personal website of Rocky Li, senior SDE at AWS, listing side projects and personal notes.
Free planOpen source
Starboard
Free
The shareable in-browser notebook
Free planOpen source
drawDB
Free
The free, open-source way to design your database and ship the SQL
Free planOpen source
Mermaid Preview
Free
Create Mermaid diagrams and charts in Slack.
Free planOpen source
Wireflow
Free
Free, online and open source tool for creating user flow prototypes
Free planOpen source
SQL Power Architect
Free
Data Modeling & Data Profiling Tool
Free planOpen source
LongoMatch
$12.50/mo
The video analysis software that helps coaches.
Free planOpen source
ImplicitCAD
Free
Powerful, Open-Source, Programmatic CAD
Free planOpen source
DiffPlug
Free
View, edit, compare. Anything, from anywhere.
Free planOpen source
Modelio
Free
The Open Source Modeling Environment UML, BPMN, ArchiMate, SysML, Togaf, Model Driver Devé
Free planOpen source
Diagramo
Free
Flowchart software | Diagram software | Flowchart diagram
Free planOpen source
UMLet
Free
Free UML tools for fast, beautiful diagrams.
Free planOpen source
TiddlyMap
Free
TiddlyMap: Create interactive concept maps directly inside your wiki.
Free planOpen source
ChartDB
$25/mo
Database diagram and data modeling tool for visualizing and designing schemas
Free planOpen source
Livebook
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Automate code & data workflows with interactive notebooks
Free planOpen source
OmniTools
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Toolkit of web-based utilities for everyday tasks such as editing images, text, lists, and
Free planOpen source
BOUML
Free
a free UML tool box
Free planOpen source
NoteDiscovery
Free
Your Self-Hosted Knowledge Base
Free planOpen source
Pluralith
$250/mo
Visualise Terraform infrastructure directly from your codebase
Free planOpen source