SkillMD for agents: the skillmds MCP server + the skillmd CLI (lint, scan, search, install, publish Agent Skills) from skillmd.com.
354 professional Agent Skills (SKILL.md) + subagents + slash commands for Claude, ChatGPT, Gemini, Cursor, Codex & Hermes. It's a CLI, not a library: run npx pm-claude-skills add --agent <tool> to install into your AI tool — no npm install needed. Or
OpenSource Agent-Native forth-generation admin panel
ClawLabor AI Capability Marketplace skill for Claude Code, OpenClaw, and Codex CLI. Discover, purchase, and sell specialized AI capabilities.