Sandbase Harness
Focus: runtime, sandbox and open source. Shares ai agents and mcp with MCP Gateway. A framework, not an AI tool. Free (MCP Gateway: Freemium). Rated 4.4 (MCP Gateway: 4.3).
AI Tool
Connect unlimited MCP servers and APIs to your AI while it only sees a handful of tools.
Rating
4.3 / 5
Pricing
Freemium
Difficulty
Advanced
Works on
macOS, Linux, Windows
Built with love by Shushant Lakhyani. Building bestproductivityresources.com
MCP Gateway is a self-hosted gateway and proxy, shipped as a single Rust binary, that sits between an AI client such as Claude, Cursor or Codex and all of its tools. Instead of loading every tool definition into each request, the agent sees a small fixed set of meta-tools, searches for the tool it needs and calls it on demand, which saves context. It includes over 100 built-in API integrations and a wizard that imports your existing MCP servers. Personal and non-commercial use is free; commercial use needs a paid licence.
Third-party open-source projects. We are not affiliated with their authors; repositories are provided as-is by their maintainers. Review each project's license, code and security before installing. See our Disclaimer.
Developers who connect lots of MCP servers to Claude, Cursor or Codex and want to cut token use.
People who only use one or two MCP servers.
Not sold on MCP Gateway? These do a similar job, and each card says what it has in common.
Focus: runtime, sandbox and open source. Shares ai agents and mcp with MCP Gateway. A framework, not an AI tool. Free (MCP Gateway: Freemium). Rated 4.4 (MCP Gateway: 4.3).
Focus: security, prompt injection and guardrails. Shares ai agents and mcp with MCP Gateway. Free (MCP Gateway: Freemium). Rated 4.7 (MCP Gateway: 4.3).
Focus: ai coding, design system and ui prompts. Shares mcp and claude with MCP Gateway. Adds Web. Rated 4.7 (MCP Gateway: 4.3).
Focus: skills, cursor and open source. Shares claude and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Rated 4.6 (MCP Gateway: 4.3).
Focus: llm apps, rag and open source. Shares ai agents and self-hosted with MCP Gateway. Adds Web. Rated 4.6 (MCP Gateway: 4.3).
Focus: agent sandboxes, e2b and sandbox. Shares self-hosted and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Adds Web. Rated 4.6 (MCP Gateway: 4.3).
Want to spend nothing? These free picks cover similar ground.
Focus: 3d printing, open source and hardware. Shares mcp and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Rated 4.4 (MCP Gateway: 4.3).
Focus: automation, workflows and source available. Shares self-hosted and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Adds Web. Rated 4.4 (MCP Gateway: 4.3).
Focus: cli, supermarkets and shopping. Shares mcp and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Rated 4.4 (MCP Gateway: 4.3).
Focus: open source, automation and bots. Shares ai agents and self-hosted with MCP Gateway. Free (MCP Gateway: Freemium). Adds Web. Rated 4.4 (MCP Gateway: 4.3).
Focus: browser automation, chromium and profiles. Shares mcp and ai agents with MCP Gateway. Free (MCP Gateway: Freemium). Same 4.3 rating.
Focus: claude code, codex and gateway. Shares ai agents and self-hosted with MCP Gateway. Free (MCP Gateway: Freemium). Adds Web. Same 4.3 rating.
New · updated daily
Real use cases shared on Reddit, Hacker News, X, GitHub and blogs, summarised in plain words with a link to every original post.
Free Notion database
Real online businesses, creators and projects, broken down by how they make money: apps, online stores, AI tools and more. Free on Gumroad.
Get the free databaseFree Notion database
Hundreds of online income methods in one place, so you can compare options and pick one to try. Free on Gumroad.
Get the free listFor research and ideas only. Results vary and nothing here is a promise of income. See our Disclaimer.
Weekly newsletter
One short email every Monday with everything shipped that week: new free tools and websites, new guides, new free browser tools and what's new in my free Gumroad libraries, plus how the site is growing. Free, and you can unsubscribe anytime.
Join the newsletterYou sign up on Gumroad, which stores your email to send the newsletter. See our Privacy Policy.