CTF OSINT Quick reference for OSINT CTF challenges. Each technique has a one-liner here; see supporting files for full details. Prerequisites Python packages (all platforms): Linux (apt): macOS (Homebrew): MCP servers (optional): Playwright MCP (microsoft/playwright-mcp) for browser-driven OSINT (JS-rendered pages, reverse-image/map flows) — see tools-mcp.md. Additional Resources - social-media.md - Twitter/X (user IDs, Snowflake timestamps, syndication API, memory.lol, Wayback CDX), Tumblr (blog checks, post JSON, avatars), BlueSky search + API, Unicode homoglyph steganography, Discord API,…