# GTM Stacker Agent Registry

> A daily-updated, agent-native registry of open-source tool discoveries, tool updates, and curated news for the go-to-market / RevOps engineering niche. Machine-readable first: agents can discover, parse, page, and delta-sync it without scraping HTML. Updated 2026-09-08. Stability of agent-native conventions: emerging.

This registry is machine-first. Prefer the structured surfaces below over scraping HTML. Every surface is self-describing and links to its schema.

## Publisher
GTM Stacker is the growth-systems practice of Theo Popov (founded 2024-08): AI-native enrichment, outbound, content engines and internal tooling for startups and venture programs. This registry is its agent-native media property.
- [About Theo Popov](https://gtmstacker.com/about/): founder entity page
- [About the registry](https://gtmstacker.com/registry/about/): registry entity home
- https://www.linkedin.com/in/theo-popov/
- https://x.com/Theo_Popov
- https://github.com/theopopov

## Primary machine surfaces
- [Catalog index (JSON)](https://gtmstacker.com/registry/registry.json): bounded index — start here (recent + categories + pagination pointers)
- [Categories](https://gtmstacker.com/registry/categories.json): directory of capabilities with counts
- [Paginated catalog](https://gtmstacker.com/registry/catalog/index.json): catalog/page-N.json — follow metadata.nextCursor
- [Full catalog (JSON)](https://gtmstacker.com/registry/catalog/all.json): every entry in one file (large; prefer pages/categories/delta)
- [Delta index (by date)](https://gtmstacker.com/registry/v0.1/by-date/index.json): fetch only what changed — best for daily re-sync
- [MCP server catalog](https://gtmstacker.com/registry/v0.1/servers.json): server.json-shaped tool catalog, paginated
- [Entry schema](https://gtmstacker.com/registry/schema/entry.schema.json): JSON Schema for a registry entry
- [OpenAPI](https://gtmstacker.com/registry/openapi.json): read API description (3.1)

## Browse by capability
- [AI Infrastructure (54)](https://gtmstacker.com/registry/category/ai-infrastructure.json): AI Infrastructure tools
- [MCP Agents (11)](https://gtmstacker.com/registry/category/mcp-agents.json): MCP Agents tools
- [Workflow Automation (26)](https://gtmstacker.com/registry/category/workflow-automation.json): Workflow Automation tools
- [Integration Orchestration (17)](https://gtmstacker.com/registry/category/integration-orchestration.json): Integration Orchestration tools
- [Analytics BI (31)](https://gtmstacker.com/registry/category/analytics-bi.json): Analytics BI tools
- [Data Scraping (25)](https://gtmstacker.com/registry/category/data-scraping.json): Data Scraping tools
- [SEO Research (15)](https://gtmstacker.com/registry/category/seo-research.json): SEO Research tools
- [Content Copywriting (6)](https://gtmstacker.com/registry/category/content-copywriting.json): Content Copywriting tools
- [CRM Sales (7)](https://gtmstacker.com/registry/category/crm-sales.json): CRM Sales tools
- [Prospecting Enrichment (6)](https://gtmstacker.com/registry/category/prospecting-enrichment.json): Prospecting Enrichment tools
- [Documents Esign (3)](https://gtmstacker.com/registry/category/documents-esign.json): Documents Esign tools
- [Commerce Payments (8)](https://gtmstacker.com/registry/category/commerce-payments.json): Commerce Payments tools
- [Email Outbound (9)](https://gtmstacker.com/registry/category/email-outbound.json): Email Outbound tools
- [Marketing Automation (5)](https://gtmstacker.com/registry/category/marketing-automation.json): Marketing Automation tools
- [Marketing Ops (13)](https://gtmstacker.com/registry/category/marketing-ops.json): Marketing Ops tools
- [Referral Affiliate (3)](https://gtmstacker.com/registry/category/referral-affiliate.json): Referral Affiliate tools
- [Lead Capture (4)](https://gtmstacker.com/registry/category/lead-capture.json): Lead Capture tools
- [Chat Helpdesk (18)](https://gtmstacker.com/registry/category/chat-helpdesk.json): Chat Helpdesk tools
- [Meetings Scheduling (7)](https://gtmstacker.com/registry/category/meetings-scheduling.json): Meetings Scheduling tools
- [Website Cms (12)](https://gtmstacker.com/registry/category/website-cms.json): Website Cms tools
- [Productivity Knowledge (10)](https://gtmstacker.com/registry/category/productivity-knowledge.json): Productivity Knowledge tools
- [Project Ops (9)](https://gtmstacker.com/registry/category/project-ops.json): Project Ops tools
- [Social Community (10)](https://gtmstacker.com/registry/category/social-community.json): Social Community tools
- [Product Discovery (7)](https://gtmstacker.com/registry/category/product-discovery.json): Product Discovery tools

## Feeds
- [JSON Feed](https://gtmstacker.com/registry/feed.json): JSON Feed 1.1 with _agent_metadata
- [Deletions feed](https://gtmstacker.com/registry/deletions.json): tombstones to prune
- [Changelog (Markdown)](https://gtmstacker.com/registry/CHANGELOG.md): Keep a Changelog
- [Changelog (JSON IR)](https://gtmstacker.com/registry/changelog.json): machine-readable, with security cross-refs

## Discovery
- [API catalog](https://gtmstacker.com/.well-known/api-catalog): RFC 9727 linkset
- [Agent card](https://gtmstacker.com/.well-known/agent.json): capabilities, feeds, MCP
- [MCP card](https://gtmstacker.com/.well-known/mcp.json): MCP entry point + transports
- [Agent Skill](https://gtmstacker.com/.well-known/agent-skills/registry/SKILL.md): how/when to use this registry
- [Sitemap](https://gtmstacker.com/sitemap.xml): all URLs with lastmod
- [llms-full](https://gtmstacker.com/llms-full.txt): recent 200 entries as one document (full data: catalog/all.json)

## Recent entries
- [Headroom (tool)](https://gtmstacker.com/registry/tool/headroom/): Open-source context-compression proxy for AI agents (Rust core; Python/TypeScript SDKs): sits betwee
- [Crew (tool)](https://gtmstacker.com/registry/tool/crew-agent-coordination/): Open-source coordination layer that lets parallel coding-agent sessions (Claude Code, Codex, opencod
- [Maintainer relicenses from MIT/LGPL to EUPL to close the SaaS loophole (news)](https://gtmstacker.com/registry/news/eupl-relicense-saas-loophole/): Henri Bergius (NoFlo, Midgard) relicensed his projects from MIT/LGPL to the EUPL-1.2 — an OSI-approv
- [Anthropic releases Commerce Agents — an Apache-2.0 reference blueprint for shopping and merchant agents (news)](https://gtmstacker.com/registry/news/anthropic-commerce-agents-blueprint/): Anthropic published Commerce Agents, an Apache-2.0 reference blueprint for building shopping and mer
- [ACI.dev (Aipolabs) (tool)](https://gtmstacker.com/registry/tool/acidev-aipolabs/): OSS alt to Composio (proprietary), Zapier-for-agents; ~4900 stars; complements Composio, Nango, Klav
- [AfterShip/email-verifier (tool)](https://gtmstacker.com/registry/tool/aftershipemail-verifier/): Most OSI-clean; Go lib; ~8mo slowing
- [Agno (tool)](https://gtmstacker.com/registry/tool/agno/): OSS alt to LangGraph; ~41632 stars; via ossinsight.io
- [aiogram (tool)](https://gtmstacker.com/registry/tool/aiogram/): ~5800 stars; complements python-telegram-bot, Telethon; Official Bot API framework (FSM, middleware,
- [airtable.js (tool)](https://gtmstacker.com/registry/tool/airtablejs/): ~2223 stars; complements pyairtable; VENDOR (Airtable) official JavaScript client for the Airtable R
- [ALwrity (tool)](https://gtmstacker.com/registry/tool/alwrity/): Full-stack content OS w/ GSC SEO; solo-maintained
- [Anomalib (tool)](https://gtmstacker.com/registry/tool/anomalib/): ~6024 stars; via ossinsight.io
- [AnythingLLM (tool)](https://gtmstacker.com/registry/tool/anythingllm/): Fully permissive; private doc chat
- [Apache Airflow (tool)](https://gtmstacker.com/registry/tool/apache-airflow/): Industry-standard DAG scheduler
- [Apache Camel K (tool)](https://gtmstacker.com/registry/tool/apache-camel-k/): 300+ connectors; K8s; heavyweight
- [Apache ECharts (tool)](https://gtmstacker.com/registry/tool/apache-echarts/): ASF governance; patent grant; markets commercial use

## Optional (live server only)
- [Live servers + updated_since](https://gtmstacker.com/v0.1/servers): requires the optional Node server
- [SSE events](https://gtmstacker.com/v0.1/events): requires the optional Node server