HEATKEYS

draw.io is a free online diagram drawing application for workflow, BPM, org charts, UML, ER, network diagrams

Draw, share and collaborate on online diagrams. Easy web flow chart, network diagram, mockup, wireframe, UML diagrams like Class, Sequence, & data flow and process flow diagrams. Creately - free web-based software for online diagram software

PlantUML is an open-source tool written in Java that uses simple textual descriptions to draw UML diagrams. Can be integrated with Word.

Online diagram and flowchart software. Create diagrams and drawings such as flowcharts, mind maps, network diagrams, UML diagrams, wireframes, user interface designs and other drawings online with LucidChart.

Altova XMLSpy XML editor, plus other leading XML, data management, UML, and Web services software tools for application, web site, and database development, data conversion, and more.

Don

Powerful online solution for the creation of flowcharts, org charts, floor plans, uml diagrams, bpmn diagrams, mind maps, venn charts, web site structures, etc.

RailRoad is a class diagram generator for Ruby on Rails applications.

Infinite ASCII diagrams, save to Google Drive, resize, freeform draw, and export straight to text/html.