Open-Source Business Models — 6 Self-Hosted Alternatives
Six open-source alternatives to popular SaaS products — resellable, white-labelable, and proven as real businesses.
1. Cal.diy (formerly Cal.com) — Open-Source Calendly
- Repo: github.com/calcom/cal.diy
- Stars: ★45,282
- Model: Fork it, white-label it, sell to dentists/lawyers for $200/mo
- Proven: Founders hit $5M ARR in 3 years
2. Ghost — Open-Source Substack
- Repo: github.com/TryGhost/Ghost
- Stars: ★53,832
- Model: Self-hosted Substack with 100% margin. 1,000 readers at
5/mo =60K/yr - Proven: Used by major publishers, has managed hosting (Ghost Pro)
3. n8n — Open-Source Zapier
- Repo: github.com/n8n-io/n8n
- Stars: ★191,681
- Model: Sell automation services at
500–2,000 per setup - Proven: Raised $14M; agency model behind it works at scale
4. Medusa — Open-Source Shopify
- Repo: github.com/medusajs/medusa
- Stars: ★34,228
- Model: Take 5% on every sale. Zero rev share to Shopify
- Proven: The most flexible open-source commerce platform
5. Listmonk — Open-Source Mailchimp
- Repo: github.com/knadh/listmonk
- Stars: ★21,421
- Model: Send unlimited emails for AWS bill cost. Resell to agencies at 10x markup
6. Penpot — Open-Source Figma
- Repo: github.com/penpot/penpot
- Stars: ★49,403
- Model: Sell self-hosted design tools to agencies who refuse client files in the cloud
The Pattern
All six follow the same playbook:
- Open-source the core product (free acquisition)
- Sell the self-hosted / white-label version to businesses who need control
- Or sell the managed cloud version to users who want convenience
Each is a proven $M+ ARR business, not just a GitHub project.