Wireflow - Create beautiful flowcharts

TiddlyMap - An interactive concept- and mind-mapping plugin for the personal note-taking software TiddlyWiki based on the Vis.js library. It's free and open-source!

Zen Flowchart - The simplest tool to create flowcharts

Minzel - Minzel is a beautiful and free mindmapping tool built for creatives and gives you the power to...

Vexlio - Instantly create precise, beautiful diagrams

Wisdomap - Wisdomap Medicine is a study aid that helps medical students create differential diagnoses and suitable management plans from a presenting complaint and structured revision notes.