Lucidchart

Freemium

Lucidchart is a web-based application to draw diagrams.

yEd Graph Editor

Free

yEd is a free general-purpose diagramming program with a multi-document interface.

LibreOffice - Draw

Open Source

LibreOffice is a full-featured office productivity suite that provides a near drop-in replacement for Microsoft Office.

Apache OpenOffice Draw

Open Source

Apache OpenOffice Draw. Makes drawing business processes and diagrams a snap! Draw - from a quick sketch to a complex plan, Draw gives you the tools to commun…

Visual Understanding Environment

Open Source

Visual Understanding Environment or VUE is a free, open source concept mapping application written in Java.

CmapTools

Free

CmapTools is concept mapping software.

Umbrello

Open Source

Umbrello UML Modeller is a free software UML diagram tool available natively for Unix-like platforms and Windows.

Bonita BPM

Open Source

Bonita BPM is an open-source business process management and workflow suite.

Dia

Open Source

Dia is free and open source drawing software.

Pencil Project

Open Source

Pencil Project is an open-source GUI prototyping tool.

Mindomo

Freemium

Mindomo is an online mind map Software where users can create, view and share mind maps in their browser.

Creately

Freemium

Creately is a collaborative diagramming and design software used by teams around the world to communicate more effectively.

PlantUML

Open Source

PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.

Edraw Max

Commercial

Edraw Max is comprehensive mind mapping and planning tool network diagrams, floor plans, workflow diagrams, business charts, and engineering diagrams.