Five repos that print money.

Workflow automation with a code escape hatch. n8n connects 400+ services with a visual editor, and when the nodes run out, you drop into JavaScript or Python mid-flow. Half the "make $10K/month with AI" content on YouTube is this tool running in the background.

• Agencies resell automation builds at $1,000–3,000 per workflow — the exact thing the "AI agency" videos teach
• Self-hosted on a $5 VPS, it replaces per-task pricing that scales with your success
• AI nodes (OpenAI-compatible endpoints, agents, vectors) are first-class, not bolted on

1. Start a cloud trial at n8n.io — or go full free forever: docker run -it --rm -p 5678:5678 n8nio/n8n
2. Build the classic three-noder: RSS trigger → Edit Fields → Telegram — a monitor that texts you when something changes
3. Activate it on an hourly schedule. You just shipped your first automation.

Scheduling infrastructure, not just a booking link. Cal.com gives you Calendly's core — availability pools, buffers, round-robin teams, workflows — free for individuals. Self-host it and your whole team stops paying per seat.

• Consultants and coaches drop a paid line-item while looking more professional
• Round-robin + routing rules are the features Calendly gates behind team tiers
• The API-first design means booking flows can be embedded in anything you build

1. Create a free account at cal.com and connect your Google or Outlook calendar
2. Set availability plus a 10-minute buffer between calls — the trick that saves your day
3. Swap your booking link into your bio and email signature. Done.

Document signing that doesn't tax you per envelope. The open-source DocuSign alternative: upload, drop signature and date fields, send, done — with audit trails and compliance framing baked in, not bolted on.

• Signing is a per-document tax on real estate, recruiting and legal ops — they feel this pain monthly
• Self-hosted means contracts never leave your infrastructure — a genuine selling point for B2B
• Higher tiers are white-label: agencies resell signing as their own product

1. Open a free account at documenso.com — or self-host with their Docker Compose setup
2. Upload a PDF, drag signature + date fields where they belong
3. Send it. Your first signed document comes back in minutes, with an audit trail attached.

Link management with analytics that don't insult you. Custom back-halves, UTM presets, QR codes, per-click geography and referrers — the exact feature list Bitly charges $35/month for, free on Dub's own hosted tier.

• Biggest single saving on this list: Bitly's entry paid plan is $420/yr for short links
• Real-time click analytics by country, referrer and device — on the free tier
• A clean public API: marketers and builders wire it into dashboards in an afternoon

1. Create a free account at dub.co
2. Shorten a link with a custom back-half (yourbrand/launch) and saved UTM presets
3. Watch the clicks arrive by country and referrer in real time — that's the $420/yr feature.

The hand-drawn whiteboard that opens in one click. No account, no install, no team setup — the fastest way from "I have an idea" to "here's the diagram." Works offline, shares via link, and the sketches look human.

• Zero friction wins adoption — send a link, everyone's drawing in seconds
• Perfect for proposals and landing-page wireframes that shouldn't look over-engineered
• The hand-drawn style keeps feedback on ideas, not on pixels

1. Open excalidraw.com — nothing to sign up for, it just starts
2. Sketch your product flow or system architecture with the arrow tool
3. Export PNG/SVG, or hit Live collaboration and share the room link.