Dia Alternatives for Online

Lucidchart is a web-based application to draw diagrams.

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

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

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

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.

Cacoo is a user friendly online drawing tool. Multiple users editing the same diagram means Real-Time Collaboration.

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

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.