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 database

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 bundles

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 dashboard

Customer support & live chat

Chatwoot — Open-source customer support platform — live chat, a shared inbox, and an omnichannel help desk

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 Meta

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