Build it. Then grow it.
Shipping is the easy part now. These are honest playbooks for the open-source build tools and marketing tools founders adopt — what each one does, where it fits your growth stack, and how to actually get users once you've built.
Open SaaS
A free, open-source SaaS boilerplate built on the Wasp full-stack framework
SaaS Boilerplate
A free, open-source Next.js SaaS starter kit with authentication, multi-tenancy, roles and permissions, i18n, and a landing page — built with Tailwind CSS, Shadcn UI, and TypeScript
Dub
Open-source link management and attribution for modern marketing teams
OpenPanel
Open-source, self-hostable product analytics — an alternative to Mixpanel and Google Analytics
listmonk
Open-source, self-hostable newsletter and mailing list manager — a single Go binary
Twenty
An open-source CRM — a self-hostable alternative to Salesforce and HubSpot
MultiPost
Open-source browser extension that publishes one piece of content to many social platforms at once
Umami
Open-source, privacy-focused web analytics — a self-hostable alternative to Google Analytics
Marketing Skills
An open-source collection of 45 marketing skills for Claude Code and AI agents
OpenSEO
Open-source alternative to Semrush and Ahrefs — keyword research, backlinks, and site audits on a pay-as-you-go model
OpenCut
A free, open-source video editor for web, desktop, and mobile — a CapCut alternative
Papermark
Open-source DocSend alternative for sharing documents and data rooms with built-in analytics
Formbricks
Open-source experience-management platform for in-app, link, and email surveys
Polar
Open-source, merchant-of-record billing for developers — usage-based pricing, subscriptions, and worldwide tax handled for you
React Email
Open-source React components for building responsive, cross-client HTML emails — the transactional and lifecycle emails your product sends
Mautic
Open-source marketing automation you host yourself — segmentation, campaigns and multi-channel journeys on your own database
React Email Editor
MIT-licensed React component that embeds Unlayer's drag-and-drop email builder inside your own product
Notifuse
Open-source, self-hosted newsletter, marketing and transactional email in one platform
Novu
Open-source notification infrastructure — one API to send in-app, email, SMS, push, and chat messages, plus connect your agents to the channels users live on
App Store Screenshots
An open-source AI-agent skill that scaffolds a Next.js editor for App Store and Google Play marketing screenshots — device frames, per-locale sets, and one-click store-ready export bundles
ASO Skills
MIT-licensed App Store Optimization skills for Claude Code, Cursor and other Agent Skills hosts, with optional live App Store data from a commercial API
Langfuse
Open-source LLM engineering platform — tracing and observability, prompt management, evaluations, datasets, and a playground for teams building AI applications
Firecrawl
Open-source web-data API — search, scrape, crawl, and map any site into clean Markdown or structured JSON that AI agents and apps can build on
Better Auth
Framework-agnostic authentication and authorization for TypeScript, run in your own app against your own database
GrowthBook
Open-source feature flags, experimentation, and product analytics you run against your own data warehouse
BrightBean Studio
Open-source, self-hostable social media management — schedule, approve, and publish across 10+ platforms from one dashboard
Postiz
Open-source social media scheduling with a public API, workflow integrations and an agent CLI
Chatwoot
Open-source customer support platform — live chat, a shared inbox, and an omnichannel help desk
LibreDesk
Open-source, self-hosted omnichannel support desk — live chat and email in a single Go binary
Ghost
Open-source publishing platform — a site, a newsletter, memberships and paid subscriptions in one install
n8n
Source-available workflow automation — a visual canvas for connecting your tools, with custom code and AI steps where you need them
Medusa
Open-source commerce platform with a built-in customization framework — commerce primitives you assemble into a store, marketplace or B2B portal
Fider
Open-source feedback portal where customers post and vote on feature requests, so you can see what to build next
OpenReplay
Open-source session replay and product analytics you can self-host, to see where users struggle and why they drop off
Payload
Open-source, Next.js-native headless CMS and app framework that installs into your existing app folder
Cap
Open-source screen recording with instant share links — a Loom alternative you can self-host
Tolgee
Open-source localization platform with in-context translation, built for developers
Docusaurus
Open-source static-site generator for documentation websites, released by Meta
docmd
Documentation compiler that emits a docs site and the machine-readable context files AI systems read, from one Markdown source
Discourse
Open-source community platform — forums, built-in chat, and plugins you self-host
Webstudio
Open-source visual website builder — a Webflow alternative you can host yourself
Usertour
Open-source user onboarding platform — in-app product tours, checklists and surveys
Next SEO
MIT-licensed React components for structured data in Next.js projects
Claude SEO
Open-source SEO audit plugin for Claude Code — parallel specialist agents that converge into one prioritized action plan
CopilotKit
Open-source frontend SDK for agent-native apps: chat UI, generative UI, shared state and human-in-the-loop
Claude Ads
Open-source paid-media operations skill for coding agents: evidence-backed audits, plans, and draft account changes across twelve ad platforms
Documenso
The open-source DocuSign alternative — self-hostable document signing built so you can audit exactly how the signature was produced
Rallly
Open-source group scheduling — propose a few dates, share one link, and let people vote without creating an account
Satori
Vercel's open-source library that turns JSX and CSS into SVG — the engine behind dynamic Open Graph images
OpenStatus
Open-source status page and uptime monitoring in one tool — self-hostable, configurable as code, checked from 28 regions
PostHog
Open-source product analytics, session replay, feature flags and experiments behind one SDK — MIT-licensed apart from its ee directory, with a monthly free tier per tool
OpenOutreach
Self-hosted GPLv3 AI sales agent that finds B2B leads from a licensed data provider and runs cold email from a mailbox you own
CrawlSEO
Self-hosted, MIT-licensed SEO monitoring that joins Google Search Console data, a site crawler and Core Web Vitals in one dashboard, with an MCP server so AI agents can query it
HeyForm
Open-source, self-hostable form builder for conversational forms, surveys and quizzes — aimed at capturing people who are not customers yet
Flexprice
Open-source usage metering, credits and invoicing for products where the cost of serving a customer is real — self-hostable, and built to sit alongside your payment processor rather than replace it
Human Review
A local visual editor for the HTML and Markdown your AI agent produces — edit in place, comment like a document, and send the whole batch back at once
AstroWind
Free, MIT-licensed Astro and Tailwind CSS template for a marketing site and blog
Metabase
Open-source business intelligence — point it at the database your product already writes to and let anyone ask questions of it
Remotion
Make videos with React — the same kind of component you write for a web page, rendered frame by frame into an MP4
Browser Use
Let an AI agent drive a real browser — open pages, click, type, fill in forms
RudderStack
A self-hostable customer data pipeline — collect an event once, send it to your warehouse and your tools
UI UX Pro Max
MIT-licensed design-intelligence skill pack that gives an AI coding assistant opinions about UI
Svix
Open-source webhooks service — send events to your customers with retries, signing and a delivery history
last30days
An agent skill that searches Reddit, X, YouTube, Hacker News, Polymarket and GitHub at once, then writes one sourced brief
PocketBase
An open-source Go backend that ships as one executable — SQLite with realtime subscriptions, users, file storage and an admin dashboard included
GoAccess
Real-time web log analyser that runs in your terminal or renders a single self-contained HTML dashboard
Meilisearch
Self-hostable search engine with typo tolerance and hybrid keyword-plus-semantic search behind one REST API
Inbox Zero
Open-source AI email assistant for Gmail and Outlook that triages your inbox and pre-drafts replies you still send yourself
Coolify
Self-hostable platform-as-a-service — deploy apps, databases and static sites onto servers you own
Decap CMS
A Git-based CMS that gives non-developers an editing screen on a site built from static files
You built it. Now grow it.
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