Top Alternatives to Diagram Designer

Lucidchart is a web-based application to draw diagrams.

draw.io is free online diagram software for making flowcharts, process diagrams, etc

Dia is free and open source drawing software.

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

Pencil Project is an open-source GUI prototyping tool.

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

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

OmniGraffle is a diagramming and digital illustration application for macOS and iOS.

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

Sketch is a proprietary vector graphics editor for Apple's macOS, developed by the Dutch company Bohemian Coding.

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

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 communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is powerful tool for technical or general posters, etc.

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

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

Google Drawings is a free, web-based diagramming software developed by Google.

Gliffy is software for diagramming via a HTML5 cloud-based app. It is used to create UML diagrams, floor plans, Venn diagrams, flowcharts and various other kinds of diagrams online.

Axure RP is a wireframing, rapid prototyping, documentation and specification software tool aimed at web and desktop applications.

SmartDraw is the smartest way to draw any type of chart, diagram: flowcharts, org charts, floor plans, network diagrams, and more.

StarUML is an opensource UML tool.

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

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

Enterprise Architect is a visual modeling and design tool based on the OMG UML.

Visual Paradigm (VP-UML) is a UML CASE Tool.

Mock up an application and show what's important, the idea, the information, the interaction.

Fluid UI is a browser-based wireframing and prototyping tool developed by Fluid Software and used to design mobile touch interfaces.

Vectr is a free online vector graphics editor.

Diagramo is an online flowchart software. It's FREE and Open Source ( GPL ) It's pure HTML5 Share and collaborate.

VisiTouch helps you view and convert to PDF your MS Visio diagrams for iPhone.

ProcessMaker is an Open source web-based workflow software and Business Process Management software.

Nevron Draw is a software for creating flowcharts and diagrams.

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

WhiteStarUML is a UML modeling tool.