59 open-source tools with a free self-host or tier plus a paid cloud/enterprise option, curated: ACI.dev (Aipolabs), Aptabase, AtroCore. 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.
Aptabase— tool, 2026-09-03 OSS alt to Google Analytics; ~1774 stars; via openalternative.co
AtroCore— tool, 2026-09-03 Most-maintained GPL; DAM one module
Betterlytics— tool, 2026-09-03 OSS alt to Google Analytics; ~172 stars; via openalternative.co
Browser Harness— tool, 2026-09-03 Pipeline inventory: Stage 5 strong acquisition fallback (fit 8/10) and Stage 2 partial enrichment extractor (fit 6/10). Self-healing harness connects LLMs to a real Chrome browser via CDP/Playwright and writes reusable helpers at runtime; complements Agent Reach/Crawl4AI/Crawlee/Lightpanda; ~16.7k stars. Expected to reduce interactive public-web extraction gaps by roughly 40-60%, but does not supply proprietary firmographic/contact data. CAVEATS: target-site ToS and…
browser-use— tool, 2026-09-03 Flagship 'make websites accessible for AI agents'; ~108k stars; CDP/Playwright; complements Crawl4AI/Browser Harness/Lightpanda; CAVEAT target-site ToS + agent runtime actions
Chroma— tool, 2026-09-03 OSS alt to Qdrant; ~28984 stars; via ossinsight.io
Contentport— tool, 2026-09-03 OSS alt to Post Bridge; ~761 stars; via openalternative.co
Crawl4AI— tool, 2026-09-03 OSS alt to Browserbase; ~77347 stars; via openalternative.co
CrewAI— tool, 2026-09-03 Highest cadence; zero advisories
Cube— tool, 2026-09-03 De-facto OSS semantic layer; not end-user UI
Documenso— tool, 2026-09-03 Modern DocuSign alt; no external PRs
Easy!Appointments— tool, 2026-09-03 Longest-lived booking; dated PHP; no routing
Ever Gauzy— tool, 2026-09-03 OSS alt to Attio; ~4305 stars; via openalternative.co
Fider— tool, 2026-09-03 OSS alt to Featurebase; ~4458 stars; via openalternative.co
Ghost— tool, 2026-09-03 GATE PASS (trademark limits branding not site resale)
Grist— tool, 2026-09-03 OSS alt to Airtable; ~11432 stars; via openalternative.co
Skyvern— tool, 2026-09-03 OSS alt to UiPath, Automation Anywhere (AI RPA); ~22700 stars; complements browser-use (XREF), LaVague, Stagehand, Notte; Drives a real browser via LLM+CV; AGPL copyleft (self-host obligations). No reverse-eng of any single platform, so no per-platform ToS flag, but automating logged-in sessions can still trip site anti-bot; use provided credentials/OAuth. Cloud offering is separate.
SurfSense— tool, 2026-09-03 OSS alt to NotebookLM; ~15811 stars; via openalternative.co
SwanLab— tool, 2026-09-03 OSS alt to Weights & Biases; ~4128 stars; via ossinsight.io
Swetrix— tool, 2026-09-03 OSS alt to Google Analytics; ~1116 stars; via openalternative.co
Usertour— tool, 2026-09-03 OSS alt to Userflow; ~2137 stars; via openalternative.co
Ycode— tool, 2026-09-03 OSS alt to Webflow; ~261 stars; young repo; via openalternative.co
Zammad— tool, 2026-09-03 OSS alt to Zendesk; ~5834 stars; via openalternative.co
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.
Dagychu— tool, 2026-09-02 Self-hosted orchestration platform for production jobs and pipelines — define repeatable workflows and run them on your own infrastructure (n8n-class). Feeds the "orchestrate" terminal stage of a scrape → enrich → outreach → analytics spine.
Omnara— tool, 2026-09-02 Open-source infrastructure for running production-grade AI agents: you build the agent, Omnara handles hosting, durable state (Postgres), sandboxes, permissions, and secrets, with any model (Anthropic/OpenAI/Bedrock/open endpoints). Cloud or fully self-hosted in your own VPC — an OSS alternative to hosted managed-agent platforms.
Khoj— tool, 2026-08-31 A self-hostable AI 'second brain': chat with local or cloud LLMs over your own PDFs/Markdown/Notion/org-mode with semantic search and cited answers, build custom agents, and use it from the browser, Obsidian, Emacs, desktop, phone, or WhatsApp. Replaces several paid AI-assistant subscriptions.
Hyperswitch— tool, 2026-08-29 Open-source payments orchestration (Rust) that routes transactions across paid PSPs (Stripe, Adyen, …) rather than replacing them — a vendor-neutral monetization layer. Apache-2.0.
Twenty— tool, 2026-08-29 Open-source, self-hostable CRM and system-of-record — an OSS alternative to Salesforce/HubSpot with a REST/GraphQL API to persist records. Core is AGPL-3.0; SDKs MIT; some features gated behind a paid Enterprise license.
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.
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.
Firecrawl— tool, 2026-08-25 The context API to search, scrape, and crawl the web at scale and turn sites into clean, LLM-ready data. Core is AGPL-3.0; SDKs/UI are MIT.
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.
GrowthBook— tool, 2026-08-25 Open-source feature flags, A/B experimentation, and product analytics across 11 warehouse sources — prove whether an LLM-generated variation actually performs better.
Langfuse— tool, 2026-08-25 LLM engineering platform: observability, evals, prompt management, traces, and datasets — for diagnosing why a marketing/GTM agent made a bad recommendation, not just that it failed.
PostHog— tool, 2026-08-25 Product & web analytics platform: session replay, funnels, feature flags, experiments, error tracking, and AI observability — with agent/MCP support. Shows what visitors did after the click.