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

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

Community chat platform with servers, text and voice channels, video, forums and a bot API, free to use with optional Nitro subscriptions

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

Browser-based collaborative interface design platform with vector editing, components, prototyping, FigJam whiteboards, Dev Mode and a plugin and REST API

Google's hosted productivity suite: Gmail, Drive, Docs, Sheets, Slides, Meet, Chat and Calendar with admin controls, Gemini features and developer APIs

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

Microsoft's chat, meetings and calling hub integrated with Microsoft 365, SharePoint and Entra ID, extensible through Microsoft Graph and Teams apps

Open-source learning management system used by universities and schools for courses, assignments, quizzes, grading and forums, self-hosted or via MoodleCloud

Hosted workspace combining block-based documents, relational databases, wikis and project views, with an API and built-in AI features

Channel-based team messaging platform from Salesforce with threads, huddles, canvases, workflow automation and an extensive bot and app API

Cross-platform task manager from Doist with natural-language scheduling, projects, labels, filters, shared projects and a public REST API

Video meetings and webinar platform, now packaged as Zoom Workplace with team chat, phone, whiteboard, AI Companion and developer APIs and SDKs