diagrams.net (previously draw.io) is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams.
Pencil is a standalone app or Firefox extension* that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Powerful vector graphics editor for the office with tools for easily creating charts, diagrams, brochures and more.
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...
Dia is a GTK+ based diagram creation program for Linux, Unix, Mac OS X and Windows released under the GPL license.
Diagramming and Flowchart making software that is part of the Microsoft Office Suite.
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. .
Google Drawings allows users to collaborate creating, sharing and editing images or drawings.
Visual Paradigm for UML (VP-UML) is a UML design tool and UML CASE tool designed to aid software development.
An easy tool for generating diagrams and flowcharts from text in a similar manner as markdown.
Knowledge base for your team:- A powerful editor with classical text and special widgets like diagrams, Swagger, GraphQL, code editor, changelogs and more coming;
Whimsical is a collaborative visual workspace for creating flowcharts, wireframes, virtual sticky notes, and more!.
Cacoo is a user-friendly online diagramming tool that allows you to create a variety of diagrams such as wireframes, flowcharts, UML diagrams, network diagrams, mindmaps...
Venn diagrams, mind maps, take notes, sketches and do other diagrams. Everything is custom and modifiable.
"If they could see what Im thinking, they'd get it!" People just understand faster with pictures.