Grow

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.

Build tools

Open SaaS — A free, open-source SaaS boilerplate built on the Wasp full-stack frameworkSaaS 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

Marketing & analytics

Dub — Open-source link management and attribution for modern marketing teamsOpenPanel — Open-source, self-hostable product analytics — an alternative to Mixpanel and Google Analyticslistmonk — Open-source, self-hostable newsletter and mailing list manager — a single Go binaryTwenty — An open-source CRM — a self-hostable alternative to Salesforce and HubSpotMultiPost — Open-source browser extension that publishes one piece of content to many social platforms at onceUmami — Open-source, privacy-focused web analytics — a self-hostable alternative to Google AnalyticsMarketing Skills — An open-source collection of 45 marketing skills for Claude Code and AI agentsOpenSEO — Open-source alternative to Semrush and Ahrefs — keyword research, backlinks, and site audits on a pay-as-you-go model

Content creation

OpenCut — A free, open-source video editor for web, desktop, and mobile — a CapCut alternative

Sales & fundraising

Papermark — Open-source DocSend alternative for sharing documents and data rooms with built-in analytics

Surveys & feedback

Formbricks — Open-source experience-management platform for in-app, link, and email surveys

Payments & billing

Polar — Open-source, merchant-of-record billing for developers — usage-based pricing, subscriptions, and worldwide tax handled for you

Email & lifecycle

React Email — Open-source React components for building responsive, cross-client HTML emails — the transactional and lifecycle emails your product sendsMautic — Open-source marketing automation you host yourself — segmentation, campaigns and multi-channel journeys on your own databaseReact Email Editor — MIT-licensed React component that embeds Unlayer's drag-and-drop email builder inside your own productNotifuse — Open-source, self-hosted newsletter, marketing and transactional email in one platform

Notifications & messaging

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 marketing & ASO

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 bundlesASO 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

AI engineering

Langfuse — Open-source LLM engineering platform — tracing and observability, prompt management, evaluations, datasets, and a playground for teams building AI applications

Web data & scraping

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

Auth & identity

Better Auth — Framework-agnostic authentication and authorization for TypeScript, run in your own app against your own database

Experimentation & analytics

GrowthBook — Open-source feature flags, experimentation, and product analytics you run against your own data warehouse

Social media management

BrightBean Studio — Open-source, self-hostable social media management — schedule, approve, and publish across 10+ platforms from one dashboardPostiz — Open-source social media scheduling with a public API, workflow integrations and an agent CLI

Customer support & live chat

Chatwoot — Open-source customer support platform — live chat, a shared inbox, and an omnichannel help deskLibreDesk — Open-source, self-hosted omnichannel support desk — live chat and email in a single Go binary

Publishing & newsletters

Ghost — Open-source publishing platform — a site, a newsletter, memberships and paid subscriptions in one install

Automation & workflows

n8n — Source-available workflow automation — a visual canvas for connecting your tools, with custom code and AI steps where you need them

Commerce & storefronts

Medusa — Open-source commerce platform with a built-in customization framework — commerce primitives you assemble into a store, marketplace or B2B portal

Customer feedback & roadmaps

Fider — Open-source feedback portal where customers post and vote on feature requests, so you can see what to build next

Session replay & product analytics

OpenReplay — Open-source session replay and product analytics you can self-host, to see where users struggle and why they drop off

CMS & app framework

Payload — Open-source, Next.js-native headless CMS and app framework that installs into your existing app folder

Video & screen recording

Cap — Open-source screen recording with instant share links — a Loom alternative you can self-host

Localization & i18n

Tolgee — Open-source localization platform with in-context translation, built for developers

Documentation & developer content

Docusaurus — Open-source static-site generator for documentation websites, released by Metadocmd — Documentation compiler that emits a docs site and the machine-readable context files AI systems read, from one Markdown source

Community & forums

Discourse — Open-source community platform — forums, built-in chat, and plugins you self-host

Website builders

Webstudio — Open-source visual website builder — a Webflow alternative you can host yourself

Onboarding & product tours

Usertour — Open-source user onboarding platform — in-app product tours, checklists and surveys

SEO & structured data

Next SEO — MIT-licensed React components for structured data in Next.js projectsClaude SEO — Open-source SEO audit plugin for Claude Code — parallel specialist agents that converge into one prioritized action plan

Agent UI & frontend

CopilotKit — Open-source frontend SDK for agent-native apps: chat UI, generative UI, shared state and human-in-the-loop

Paid media & ads

Claude Ads — Open-source paid-media operations skill for coding agents: evidence-backed audits, plans, and draft account changes across twelve ad platforms

Contracts & e-signature

Documenso — The open-source DocuSign alternative — self-hostable document signing built so you can audit exactly how the signature was produced

Scheduling & meetings

Rallly — Open-source group scheduling — propose a few dates, share one link, and let people vote without creating an account

Social cards & OG images

Satori — Vercel's open-source library that turns JSX and CSS into SVG — the engine behind dynamic Open Graph images

Status pages & uptime monitoring

OpenStatus — Open-source status page and uptime monitoring in one tool — self-hostable, configurable as code, checked from 28 regions

Product analytics

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

Outbound sales & cold email

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

SEO monitoring & audits

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

Forms & lead capture

HeyForm — Open-source, self-hostable form builder for conversational forms, surveys and quizzes — aimed at capturing people who are not customers yet

Usage-based pricing & metering

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

AI review & human-in-the-loop

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

Landing pages & site templates

AstroWind — Free, MIT-licensed Astro and Tailwind CSS template for a marketing site and blog

Business intelligence & dashboards

Metabase — Open-source business intelligence — point it at the database your product already writes to and let anyone ask questions of it

Programmatic video

Remotion — Make videos with React — the same kind of component you write for a web page, rendered frame by frame into an MP4

Browser automation

Browser Use — Let an AI agent drive a real browser — open pages, click, type, fill in forms

Customer data pipelines

RudderStack — A self-hostable customer data pipeline — collect an event once, send it to your warehouse and your tools

Design systems & UI

UI UX Pro Max — MIT-licensed design-intelligence skill pack that gives an AI coding assistant opinions about UI

Webhooks & integrations

Svix — Open-source webhooks service — send events to your customers with retries, signing and a delivery history

Audience & trend research

last30days — An agent skill that searches Reddit, X, YouTube, Hacker News, Polymarket and GitHub at once, then writes one sourced brief

Backend & app foundations

PocketBase — An open-source Go backend that ships as one executable — SQLite with realtime subscriptions, users, file storage and an admin dashboard included

Server logs & traffic analysis

GoAccess — Real-time web log analyser that runs in your terminal or renders a single self-contained HTML dashboard

Search & discovery

Meilisearch — Self-hostable search engine with typo tolerance and hybrid keyword-plus-semantic search behind one REST API

Inbox & email triage

Inbox Zero — Open-source AI email assistant for Gmail and Outlook that triages your inbox and pre-drafts replies you still send yourself

Self-hosting & deployment

Coolify — Self-hostable platform-as-a-service — deploy apps, databases and static sites onto servers you own

Git-based CMS & content editing

Decap CMS — A Git-based CMS that gives non-developers an editing screen on a site built from static files