# Stackmark

> The trusted catalog for AI capabilities. Stackmark is a free directory of AI building blocks: prompts, skills, workflows, agents, tools, MCP servers, models, datasets, APIs and frameworks, with sources, licenses and popularity in one place. About 47.9K public listings, refreshed daily.

Stackmark lists and links to AI building blocks; it doesn't host or run them. Most listings are imported from the official MCP Registry, Hugging Face and GitHub (with stars or likes as a popularity signal); others are shared by members and reviewed before publishing. Each listing page states its type, source, license and popularity.

## Categories

- [Prompts](https://stackmark.dev/browse/prompts): Ready-to-use prompts for ChatGPT, Claude and other assistants, organized by job and level. (1,567 listed)
- [Skills](https://stackmark.dev/browse/skills): Reusable agent skills: packaged instructions and files that teach AI agents new abilities. (895 listed)
- [Workflows](https://stackmark.dev/browse/workflows): Multi-step AI workflows and automations you can adapt and run. (76 listed)
- [Agents](https://stackmark.dev/browse/agents): Open-source and hosted AI agents for coding, research, browsing and more. (811 listed)
- [Tools](https://stackmark.dev/browse/tools): Developer tools and utilities for building with large language models. (235 listed)
- [MCP servers](https://stackmark.dev/browse/mcp-servers): Model Context Protocol servers that connect AI assistants to apps, data and services. (39,053 listed)
- [Models](https://stackmark.dev/browse/models): Popular open models for text, images, audio, embeddings and more. (3,060 listed)
- [Datasets](https://stackmark.dev/browse/datasets): Widely used datasets for training and evaluating AI models. (1,559 listed)
- [APIs](https://stackmark.dev/browse/apis): AI APIs for language, vision, speech, search and inference. (28 listed)
- [Frameworks](https://stackmark.dev/browse/frameworks): Frameworks for building agents, RAG systems and LLM applications. (581 listed)

## Pages

- [About and FAQ](https://stackmark.dev/about): what Stackmark is, where listings come from, how ranking works
- [Top contributors](https://stackmark.dev/leaderboard)
- [Sitemap](https://stackmark.dev/sitemap.xml): every public listing

## Public JSON API

- Search: https://stackmark.dev/api/catalog/items?search=QUERY&type=TYPE&sort=popular&limit=24 (TYPE is one of: prompt, skill, workflow, agent, tool, mcp_server, model, dataset, api, framework)
- One listing: https://stackmark.dev/api/catalog/items/ID
- Totals: https://stackmark.dev/api/catalog/stats

## Policies

- [Privacy](https://stackmark.dev/privacy)
- [Terms](https://stackmark.dev/terms)
- Contact: hello@stackmark.dev