EdgeEver is a new open-source knowledge base (AGPL-3.0, about 2,400 stars) that keeps Evernote’s three-pane layout and adds mind maps, database tables, poster notes, a web clipper and MCP, with clients on every platform. It runs free on Cloudflare’s Workers, D1 and R2 free tier, or installs on a VPS or NAS with one Docker command. This guide covers the demo, choosing a deployment, migrating from Evernote and what to know first.

security-audit is an open-source coding agent skill from Cloudflare’s security team (MIT, about 34K stars) and the starting point of its internal vulnerability-hunting system. Install it in Claude Code or Codex, say “security audit this codebase”, and it runs reconnaissance, hunting, adversarial validation, structured output, independent review and reporting. We tested the install and bundled tests and explain the two modes, three tiers, sandboxing and cost.