Boostnote - Boostnote is an open-source note-taking app.
Xmind - Xmind is a brainstorming and mind mapping application.
Supernotes - The fastest way to take notes and collaborate with friends. Create notecards with Markdown, LaTeX, images, emojis and more. Get started for free!
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Draft - A tool for developers to create cloud-native applications on Kubernetes
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.