Slack

Slack API provides comprehensive access to team communication features including messaging, file sharing, channels, and workspace management. OAuth 2.0 is the standard authentication method with granular permission scopes.

The Web API offers 200+ methods for building custom integrations and bots. Bolt framework available for Python, JavaScript, and Java simplifies app development. Events API enables real-time event subscriptions via webhooks or Socket Mode. Rate limits are tier-based with excellent documentation and SDKs. Free tier available with generous limits. Ideal for team collaboration tools, chatbots, workflow automation, and business integrations.