7 Open-Source Repos That Replace Paid Apps You Use Every Week

You pay monthly for scheduling, automation, analytics, e-signatures, note-taking, secrets management and forms. Each one has an open-source equivalent on GitHub — free to self-host, with the code visible. Here are seven, with star counts and what they replace.

The 7 repos

1. Cal.com — replaces Calendly

Open-source scheduling with unlimited bookings, no per-seat pricing. Supports round-robin, collective availability and calendar sync. Over 48,000 GitHub stars (calcom/cal.diy). Calendly's free plan caps you at one event type; Cal.com self-hosted has no cap at all.

2. n8n — replaces Zapier

Visual workflow automation with 400+ integrations. The key difference: no task limit on self-hosted. Zapier's free tier allows 100 tasks/month and caps at 5 workflows. n8n has passed 200,000 GitHub stars (n8n-io/n8n) and runs on a single Docker container.

3. Plausible — replaces Google Analytics (paid tier)

Privacy-first, lightweight analytics. The entire script is under 1 KB — no cookies, no consent banners needed. Around 29,000 GitHub stars (plausible/analytics). Replaces Google Analytics for teams that pay for GA360 or want GDPR compliance without the legal overhead.

4. Documenso — replaces DocuSign

Open-source electronic signatures, legally binding under eIDAS and ESIGN. DocuSign's cheapest plan runs $15/month per sender. Documenso self-hosted costs nothing. Over 15,000 GitHub stars (documenso/documenso), active development, API-first.

5. AppFlowy — replaces Notion

Local-first workspace: notes, databases, kanban boards, all stored on your machine by default. Markdown-based, with an interface that mirrors Notion's layout closely. Over 76,000 GitHub stars (AppFlowy-IO/AppFlowy) — one of the most-starred productivity repos on GitHub. No content locked behind a paid tier because the data is yours from the start.

6. Infisical — replaces HashiCorp Vault / 1Password Teams

Secrets management for dev teams: environment variables, API keys, certificates. Dashboard, CLI, native integrations with Kubernetes, Vercel, AWS. Over 29,000 GitHub stars (Infisical/infisical). HashiCorp Vault is powerful but notoriously complex to operate; Infisical aims for the same job with a simpler setup.

7. Typebot — replaces Typeform

Open-source conversational forms with a drag-and-drop builder. Conditional logic, integrations, custom domains. Over 10,000 GitHub stars (baptisteArno/typebot.io). Typeform's free plan limits responses to 10/month; Typebot self-hosted has no response cap.

Star counts checked on 15 September 2026 — click through to see the current number.

The catch

Three of these seven — Cal.com, n8n and Plausible — offer a paid cloud version. The open-source code is real, but the hosted convenience costs money, just like the tools they replace. Self-hosting is genuinely free, but it requires a server, maintenance and someone who knows what a reverse proxy is.

There is a bigger pattern worth noting. Notion started generous and tightened its free tier. Figma did the same after the Adobe deal fell through. Canva locked Background Remover behind Pro. VC-backed open-source projects follow the same arc: grow free, monetize later, restrict what was once unlimited. The repos above are no exception — the ones with venture funding will eventually push harder on their paid plans. If you want the free version to stay free, the safest move is to self-host and pin your version.

What this list is and what it isn't

This is not a recommendation to migrate everything this weekend. Switching seven tools at once is a project, not a shortcut. The point is simpler: for most of these categories, an open alternative exists, it works, and the code is public. Knowing that changes the negotiation — even if you stay on the paid tool, you stay because you chose to, not because you had to.

Want the calm version of AI news like this, once a week? Subscribe to the Sharp AI Hub newsletter →