Most AI assistants only talk. Sunday does the work — a personal agent and second brain that lives on your Mac, remembers everything you tell it, and acts on your browser, files, terminal and email, asking before anything goes out. It fills out job applications, reads your email, drives a browser with saved logins, hands builds to Claude Code/Codex, and makes real PDFs and decks. Memory is plain markdown you own. Free & open source (MIT), with six built-in apps.