20 tools that speak the Model Context Protocol, curated: ACI.dev (Aipolabs), CLI-Anything, Composio. Every entry lists license, pricing, and links.
ACI.dev (Aipolabs)— tool, 2026-09-03 OSS alt to Composio (proprietary), Zapier-for-agents; ~4900 stars; complements Composio, Nango, Klavis; Apache-2.0. Open infra: multi-tenant auth, 600+ tools, and a Unified MCP server + VibeOps. Connectors use each app's official OAuth/API keys -> ethical_risk empty.
CLI-Anything— tool, 2026-09-03 Framework and registry for making existing software agent-native through structured CLIs; seven-phase harness generator, CLI-Hub package manager, JSON output, tests, SKILL.md generation, and maintained harnesses for creative, productivity, engineering, GIS, media, and developer applications; ~47.6k stars; generated CLIs execute the permissions of their wrapped software — review before agent use
Composio— tool, 2026-09-03 OSS alt to Zapier-for-agents, proprietary tool platforms; ~29600 stars; complements ACI.dev, Nango, Pipedream, MCP servers; Root LICENSE is MIT (some managed-server subdirectories carry Elastic-2.0). Handles OAuth/managed-auth to 250+ apps and exposes them as agent tools/MCP; uses each app's official credentials -> ethical_risk empty. Cloud offering is separate.
Klavis AI— tool, 2026-09-03 OSS alt to Composio MCP, proprietary MCP hubs; ~5800 stars; complements modelcontextprotocol/servers, ACI.dev, MetaMCP; Apache-2.0. Fleet of per-app MCP servers with built-in OAuth flows (Gmail/Slack/GitHub/Notion/Jira/etc.); uses each provider's official OAuth -> platform-tos empty. Self-hostable or hosted.
MCPJungle— tool, 2026-09-03 OSS alt to proprietary MCP gateways; ~1200 stars; complements MetaMCP, lasso mcp-gateway; MPL-2.0 (weak copyleft). Self-hosted registry+gateway: register servers once, expose one endpoint to Claude/Cursor/Codex/agents with access control. Auth delegated to registered servers. No per-platform ToS flag.
MetaMCP— tool, 2026-09-03 OSS alt to proprietary MCP gateways; MCP Context Forge (XREF); ~2600 stars; complements MCPJungle, lasso mcp-gateway, Klavis; MIT (successor to metatool-app). Groups MCP servers into namespaces, exposes unified SSE/HTTP/OpenAPI endpoints with middlewares + API-key/OIDC auth, Docker-packaged. It fronts other servers; auth is delegated to them. No per-platform ToS flag.
modelcontextprotocol/servers— tool, 2026-09-03 OSS alt to proprietary agent-tool plugins; ~89000 stars; complements Klavis, awesome-mcp-servers, MCP Context Forge (XREF); Reference servers under MIT, transitioning to Apache-2.0 (new contributions Apache-2.0; unrelicensed MIT contributions stay MIT) -> OSI-open either way. Each server uses the target service's official auth. No per-platform ToS flag.
ToolHive Registry Catalog— tool, 2026-09-03 Open-source registry catalog of MCP servers from Stacklok. Demonstrates twin catalog streams — servers for executable components and skills for reusable prompt workflows — with an allowedTools array that bounds which tools a skill may invoke.
Model Context Protocol Registry— tool, 2026-09-03 Community-driven registry service for Model Context Protocol servers. Provides a stateless REST read API (v0.1) with cursor pagination and updated_since delta sync, plus the server.json entry schema that standardizes tool distribution metadata.
October Bus— tool, 2026-09-03 A local-first coordination layer for AI agents and harnesses: agents discover peers, exchange durable messages, delegate work, coordinate shared tasks, and request human input — with delivery guarantees and identity management and no cloud control plane. Go daemon + SQLite, TypeScript SDK, MCP bindings.
URL Intelligence Agent— tool, 2026-08-31 An evidence-first enrichment agent that turns a public URL into structured, sourced intelligence: entity resolution, contact/team extraction, tech-stack detection, brand assets, SEO/security signals, and relationship graphs — with confidence scores and provenance. Runs as CLI, HTTP API, MCP server, or self-hosted service.
OpenSEO— tool, 2026-08-29 Self-hostable, open-source alternative to Semrush/Ahrefs: keyword research, rank tracking, backlinks, and site audits, with a first-class MCP + AI-skills surface. Bring your own DataForSEO key; no forced subscription.
Itsuki— tool, 2026-08-29 Open-source memory engine for AI agents over REST API + MCP: captures conversations/events into typed, versioned, reversible objects (facts, entities, relationships, events) accessible across 26+ tools, with an audit trail and JSON export.
Activepieces— tool, 2026-08-25 Open-source workflow automation (Zapier alternative): no-code builder, 280+ integrations, a TypeScript pieces framework, and ~400 MCP servers for LLM integration. Self-hostable.
Chrome DevTools MCP— tool, 2026-08-25 MCP server that lets an agent inspect and control a live Chrome browser — performance traces, network requests, console errors, rendered pages, and screenshots.
Firecrawl MCP Server— tool, 2026-08-25 Official Firecrawl MCP server that brings web search, scraping, crawling, and structured extraction to MCP-compatible agents as clean, agent-ready context.
Google Analytics MCP Server— tool, 2026-08-25 The official Google Analytics team's MCP server: run GA4 core/funnel/realtime reports and property queries through the Analytics read scope — one of the safer direct marketing-data connections.
Google Agent Skills— tool, 2026-08-25 Google's official collection of Agent Skills across infrastructure, databases, AI/ML, security, and developer tools (incl. Google Ads/Analytics developer workflows). Installable via `npx skills add google/skills`. Broad, not marketing-only.
Playwright MCP— tool, 2026-08-25 Microsoft MCP server that lets agents automate a browser via structured accessibility snapshots (not screenshots) — for rendered-page checks, forms, funnels, and landing-page QA.
oc (only-cli)— tool, 2026-08-25 Open-source CLI that fetches a web page and returns a compact numbered view instead of raw HTML — a cheap web-read layer for scraping/enrichment agents. Installs as a CLI and as an agent skill (npx skills add).