Apple Notes
Apple Inc. · Personal knowledge management
Apple's built-in notes app for Mac, iPhone, iPad and iCloud.com with folders, tags, attachments, handwriting, shared notes and on-device search
ProprietaryFreeLocalNov 2, 2026
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Excalidraw
Excalidraw · Design & prototyping
Open-source virtual whiteboard for hand-drawn-style diagrams with live collaboration, embeddable as a React component, plus a hosted Excalidraw+ service
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
Moodle
Moodle Pty Ltd (Moodle HQ) · Collaboration & communication
Open-source learning management system used by universities and schools for courses, assignments, quizzes, grading and forums, self-hosted or via MoodleCloud
GPL-3.0-or-laterOpen sourceFreeSelf-hostedBroken
Obsidian
Dynalist Inc. (Obsidian) · Personal knowledge management
Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish
ProprietaryFreePaidLocalBroken
Tailwind CSS
Tailwind Labs · Web frameworks & UI
Utility-first CSS framework from Tailwind Labs that styles markup with composable class names and generates only the CSS a project uses
MITOpen sourceFreeLocalNov 2, 2026
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