Web-based Software

Diagrams.net

Software for creating flowcharts, UML diagrams etc.

Elevation of Privilege

Online card game for an easy introduction to threat modeling

Etherpad

Open source online editor providing collaborative editing in real-time

Excalidraw

Collaborate to sketch diagrams that have a hand-drawn feel to them

HedgeDoc

Real-time collaborative markdown note editor

JSON Crack

Turn nested JSON code into clear graphs in no time.

LibreTranslate

Translate words, sentences or complete documents in compliance with data protection regulations

Overleaf CE

Open source, collaborative online LaTeX editor, also known as "ShareLaTeX"

Scrumblr

Online whiteboard for collaborative work with virtual post-its and index cards

Wekan

Kanban board for card-based task management