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Instead of starting with a blank screen, SmartDraw gives you the exact template you need.
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LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
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Online diagramming application.
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Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
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Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
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Simplify and communicate complex information using data-linked diagrams.
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Gephi is an open-source software for visualizing and analyzing large networks graphs.
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Graphviz is open source graph visualization software. It has several main graph layout programs.
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StarUML.
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An all-in-one diagram software for flowchart, org chart and more.
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Draw, LibreOffice, ODF, open standards, creative software, vector drawing.
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UMLet - Free UML Tool for Fast UML Diagrams.
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Umbrello UML Modeller is a Unified Modelling Language diagram programme for KDE.
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Cloudcraft is a free service for creating AWS diagrams for software developers, architects and technical designers.
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Diagram Designer.
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UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
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NClass is a free tool to easily create UML class diagrams with full C# and Java language support.
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Professional Flow Chart & Diagram Software.
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ArgoUML, free and safe download. ArgoUML latest version: Open-source diagramming application for personal computers. ArgoUML is a program that allows users to create complex and professional diagrams.
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Gaphor is a Python-based, open source, multiplatform and multipurpose modeling application for creating nice UML diagrams for documentation.