Lucidchart is a web-based application to draw diagrams.

Microsoft Visio (formerly Microsoft Office Visio) is a diagramming and vector graphics application and is part of the Microsoft Office family.

ConceptDraw PRO is diagramming software used to create business graphics, including ConceptDraw Flowcharting Suite.

Calligra Flow (Kivio) is free diagramming software that is a part of Calligra Suite, an integrated graphic art and office suite by KDE.

Diagrammix is a tool for efficiently building attractive diagrams and flowcharts.

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

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

Grafio is a fun and capable diagraming app for iOS with plenty of features at a fraction of the cost of others.

Nevron Draw is a software for creating flowcharts and diagrams.