Directory

Apple's built-in notes app for Mac, iPhone, iPad and iCloud.com with folders, tags, attachments, handwriting, shared notes and on-device search

Markdown note-taking app for Mac, iPhone and iPad from Shiny Frog with nested tags, note links and iCloud sync, free with a Pro subscription

Block-based document and notes app with native Apple, Windows and web clients, structured pages, collections and shareable published documents

Free diagramming editor (formerly diagrams.net) for flowcharts, network, UML and architecture diagrams, available as web app, desktop app and integrations

Open-source virtual whiteboard for hand-drawn-style diagrams with live collaboration, embeddable as a React component, plus a hosted Excalidraw+ service

Open-source, outliner-based knowledge base storing notes as local Markdown or Org-mode files with block references, queries and a graph view

JavaScript library that renders flowcharts, sequence, class, state, ER, Gantt and other diagrams from a Markdown-like text syntax

Microsoft's subscription suite of Office desktop and web apps, Exchange email, OneDrive, SharePoint and Teams with Copilot and Graph APIs

Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish

Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency

Utility-first CSS framework from Tailwind Labs that styles markup with composable class names and generates only the CSS a project uses

Personal task manager for Mac, iPhone, iPad, Apple Watch and Apple Vision Pro from Cultured Code, sold as one-time purchases with free Things Cloud sync