Lucidchart is a visual workspace that combines diagramming, collaboration, and data visualization to accelerate understanding and drive innovation. With this intuitive, cloud-based solution, everyone can work visually and collaborate in real time.

Prototyping - Team Collaboration - Web-Based - General-purpose diagramming

Dia is a program to draw structured diagrams.

Extensible by Plugins/Extensions - WYSIWYG Support - Lightweight - Flow Chart

Single-user mockup / wireframing / diagramming tool

Prototyping - Cliparts - Export to SVG - Sketching

Powerful vector graphics editor for the office with tools for easily creating charts, diagrams, brochures and more.

Export to CSV - Extensible by Plugins/Extensions - Portable - Lightweight

yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just pressing a button

Portable - Flow diagram visualisation - BPMN diagrams - Create UML entities

XMind, a full-featured mind mapping and brainstorming tool, designed to generate ideas, inspire creativity, brings efficiency both in work and life.

Portable - Icon sets - Knowledge Management - Mind Mapping

Lucidchart is a visual workspace that combines diagramming, collaboration, and data visualization to accelerate understanding and drive innovation. With this intuitive, cloud-based solution, everyone can work visually and collaborate in real time.

Prototyping - Team Collaboration - Web-Based - General-purpose diagramming

Penpot is the first Open Source design and prototyping platform meant for cross-domain teams.

Prototyping - UX Design - UI Design - Real time collaboration

Open-source, Java-based UML diagram maker using plain text descriptions to draw models.

Portable - Create UML entities - Text Based Format - VCS Friendly

Diagramming and Flowchart making software that is part of the Microsoft Office Suite.

Flow Chart - Workflow - Mind Mapping - Real time collaboration

Google Drawings allows users to collaborate creating, sharing and editing images or drawings.

Cloud based - Charts - Flow Chart - Drawing 2D

Create hand-drawn diagrams with the easy and intuitive, open-source whiteboard tool for the web.

Free hand drawing - Interactive Whiteboard - Export to SVG - Handwriting

a simple yet powerful mindmapping tool that supports brainstorming, presentation and collaboration .

Password encryption - Icon sets - Cloud sync - Google Drive integration

OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click

Self-hosted search - Flow Chart - ER Diagrams - Graphs

Graphviz is open source graph visualization software.

Graph editing - Graphs

MURAL is a visual collaboration workspace for modern teams

Self-hosted search - Online collaboration - Infinite canvas - Visual-thinking

TiddlyMap is a TiddlyWiki plugin that turns your favourite personal note taking software in a wiki-concept-map hybrid! Yes, you will be able to do both: drawing maps and putting down knowledge in a wiki way.

Cross browser support - Mind Mapping - Browser based

Scapple is an easy-to-use tool for getting ideas down as quickly as possible and making connections between them

Mind Mapping - Fullscreen support - Note-taking

Whimsical is a collaborative visual workspace for creating flowcharts, wireframes, virtual sticky notes, and more!

UX Design - Flow diagram visualisation - Flow Chart - Mind Map view

An all-in-one diagram software for flowchart, org chart and more.

Flow Chart - Mind Map view - Gantt-charts - Organization