Developer Tools · 10 tools · curated by humans

The Open-Source SaaS Stack

Everything you'd need to run a SaaS, where every layer can be self-hosted.

Self-hosting got serious. The tools below are not 'OSS-flavored' — they're proper open-source projects with viable hosted offerings. You can start with the cloud version and migrate later if you outgrow it, or self-host from day one for full control.

№01

Supabase Freemium

The backend. Postgres + auth + storage + realtime, all open-source, all self-hostable.

The open-source Firebase alternative.

See listing → Visit Supabase ↗

№02

Cal.com Freemium

The scheduler. Calendly alternative that you can run on your own infrastructure.

Open-source Calendly alternative with extreme customization.

See listing → Visit Cal.com ↗

№03

Plausible Paid

The analytics. GA alternative — self-host or use the hosted cloud.

Privacy-friendly Google Analytics alternative.

See listing → Visit Plausible ↗

№04

PostHog Freemium

The product-OS. Analytics + flags + replay + experiments — fully open source, self-hostable.

Open-source product analytics, feature flags, session replay, and more.

See listing → Visit PostHog ↗

№05

Umami Freemium

The lighter analytics option. If you don't need PostHog's full breadth.

Open-source, privacy-focused web analytics.

See listing → Visit Umami ↗

№06

Polar Paid

The merchant of record. Open-source payments/subs/licenses for SaaS.

Open-source merchant of record built for developers.

See listing → Visit Polar ↗

№07

Ghost Freemium

The publishing platform. Substack alternative — newsletters and memberships on your own domain.

The open-source platform for independent publishers.

See listing → Visit Ghost ↗

№08

Trigger.dev Freemium

The job runner. Background jobs and AI workflows in TypeScript, self-host or use the cloud.

Open-source background jobs framework, with cloud.

See listing → Visit Trigger.dev ↗

№09

Flagsmith Freemium

The feature flags. Open-source LaunchDarkly alternative — battle-tested.

Open-source feature flags and remote config.

See listing → Visit Flagsmith ↗

№10

Penpot Free

The design tool. Figma alternative that you actually own.

The open-source design and prototyping platform.

See listing → Visit Penpot ↗

More collections

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The Cold Email Stack

The exact tools we'd use to run high-volume cold outbound in 2026.

The AI App Starter Pack

Ship a production AI feature this week — without standing up your own infra.

The Modern CRM Stack

What founders and small GTM teams actually use in 2026 — not the Salesforce stuff.