Graphity is described as 'diagram editor that can be used to quickly and effectively generate drawings and to apply automatic layouts to a range of different diagrams and networks' and is an website in the Office & Productivity category. There are more than 25 alternatives to Graphity, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Android. The best alternative is diagrams.net, which is both free and Open Source. Other great sites and apps similar to Graphity are LibreOffice - Draw (Free, Open Source), yEd Graph Editor (Free), Dia (Free, Open Source) and PlantUML (Free, Open Source).
Merge Plan is a user friendly diagram application. It is fully compatible with most diagram file formats. It is a great value in comparison to other diagram applications. It is part of Merge Soft Office.
CADE is a compact but powerful 2D vector editor for Windows. It includes basic Microsoft Office Visio functionality and could be used to create diagrams, network diagrams, flowcharts, schemas, maps and so much more.