The Best Open Source Projects by GitHub Stars in 2026
·OSSAlt Team
open-sourcegithubpopular2026ranking
The Best Open Source Projects by GitHub Stars in 2026
GitHub stars aren't everything — but they signal community interest, adoption, and momentum. Here are the most-starred open source SaaS alternatives in 2026.
Top 30 by Stars
Tier 1: 50K+ Stars
| Project | Stars | Category | Replaces |
|---|---|---|---|
| Supabase | 73K+ | Backend-as-a-Service | Firebase |
| Hoppscotch | 66K+ | API testing | Postman |
| Uptime Kuma | 58K+ | Monitoring | Better Stack, Pingdom |
| n8n | 48K+ | Automation | Zapier |
| NocoDB | 48K+ | Spreadsheet/Database | Airtable |
| Meilisearch | 47K+ | Search | Algolia |
| Appwrite | 45K+ | Backend-as-a-Service | Firebase |
| OpenHands | 42K+ | AI Coding Agent | — |
Tier 2: 25K-50K Stars
| Project | Stars | Category | Replaces |
|---|---|---|---|
| Metabase | 39K+ | BI/Analytics | Tableau, Power BI |
| Sentry | 39K+ | Error tracking | Datadog Errors |
| Vaultwarden | 39K+ | Password manager | 1Password |
| Cal.com | 35K+ | Scheduling | Calendly |
| Coolify | 35K+ | PaaS | Vercel, Heroku |
| Penpot | 33K+ | Design | Figma |
| Slidev | 33K+ | Presentations | Google Slides |
| Grafana | 65K+ | Observability | Datadog |
| Plane | 30K+ | Project management | Jira, Linear |
| Mattermost | 30K+ | Team chat | Slack |
| Dokku | 29K+ | PaaS | Heroku |
| Outline | 28K+ | Documentation | Notion, Confluence |
| Medusa | 26K+ | E-commerce | Shopify |
| Redash | 26K+ | BI | Tableau |
| Aider | 25K+ | AI coding | Copilot |
Tier 3: 15K-25K Stars
| Project | Stars | Category | Replaces |
|---|---|---|---|
| Chatwoot | 21K+ | Customer support | Intercom, Zendesk |
| Tabby | 22K+ | AI coding | Copilot |
| Typesense | 21K+ | Search | Algolia |
| Plausible | 20K+ | Analytics | Google Analytics |
| Continue | 20K+ | AI coding | Copilot |
| Twenty | 20K+ | CRM | Salesforce, HubSpot |
| KeePassXC | 20K+ | Password manager | 1Password |
| Dub | 19K+ | Link management | Bitly |
| Formbricks | 8K+ | Forms/Surveys | Typeform |
| Bitwarden | 16K+ | Password manager | 1Password |
| Listmonk | 15K+ | Email marketing | Mailchimp |
Stars vs Quality: What Actually Matters
Stars don't always correlate with the best tool. Here's what to look at instead:
More Meaningful Metrics
| Metric | What It Shows | Where to Find It |
|---|---|---|
| Monthly commits | Active development | GitHub Insights |
| Open issues ratio | Maintenance quality | Issues tab |
| Release frequency | Shipping speed | Releases tab |
| Contributors | Community health | Contributors page |
| Discussion activity | Community engagement | Discussions tab |
| Time to first response | Maintainer engagement | Issues tab |
Stars Can Be Misleading
| Project | Stars | Reality |
|---|---|---|
| High stars, low commits | Popular but stagnant | May be abandoned |
| Low stars, high commits | New but active | Rising star worth watching |
| High stars, many open issues | Popular but overwhelmed | May have quality issues |
| Moderate stars, fast releases | Healthy project | Often the best choice |
The Fastest Growing (2025-2026)
These projects gained the most stars in the past year:
| Project | Stars Gained (12 months) | Current Total | Why It's Growing |
|---|---|---|---|
| OpenHands | +25K | 42K+ | AI agent coding took off |
| Coolify | +15K | 35K+ | Self-hosting renaissance |
| Dub | +10K | 19K+ | Link management for developers |
| Plane | +12K | 30K+ | Modern Jira alternative |
| Twenty | +12K | 20K+ | Modern CRM |
| Aider | +15K | 25K+ | AI pair programming |
| Formbricks | +4K | 8K+ | Open source Typeform |
Stars-to-Quality Ratio
Our picks for the best actual tools (not just most starred):
Best Tool vs Most Stars (Same Category)
| Category | Most Starred | Best Tool (Our Pick) | Why |
|---|---|---|---|
| BaaS | Supabase (73K) | Supabase | Stars match quality here |
| Search | Meilisearch (47K) | Meilisearch or Typesense | Both excellent, different strengths |
| Analytics | Matomo (20K) | Plausible (20K) | Simpler, privacy-first, growing faster |
| PM | Plane (30K) | Plane | Modern, fast, good UX |
| Chat | Mattermost (30K) | Mattermost | Most mature, best integrations |
| CRM | Twenty (20K) | Twenty | Only modern option |
| Passwords | Vaultwarden (39K) | Vaultwarden | Light, compatible, perfect |
Underrated (Low Stars, Great Tool)
| Project | Stars | Category | Why It's Underrated |
|---|---|---|---|
| GlitchTip | 1K+ | Error tracking | Sentry-compatible, 10% of resources |
| Documenso | 6K+ | E-signatures | Best DocuSign alternative |
| Zammad | 4K+ | Helpdesk | Full Zendesk replacement |
| Bugsink | 2K+ | Error tracking | Runs on 512 MB RAM |
| Rallly | 3K+ | Polls/Scheduling | Perfect Doodle replacement |
How to Use Stars When Evaluating
Stars Are Good For:
- Initial discovery — finding tools you didn't know existed
- Gauging community size — more stars = more community content
- Comparing relative popularity within a category
- Identifying trending projects
Stars Aren't Good For:
- Comparing across categories (a React library will always beat a niche tool)
- Judging code quality
- Predicting long-term sustainability
- Determining if it fits your specific use case
Our Evaluation Process
When we recommend a tool on OSSAlt, we look at:
- Feature completeness — Does it actually replace the SaaS tool?
- Self-hosting experience — Docker support, documentation quality, ease of setup
- Active development — Recent commits, responsive maintainers
- Community health — Discussions, guides, third-party content
- License — Is it truly open source? Any restrictions?
- Resource usage — How much RAM/CPU does it need?
- Data portability — Can you export and migrate away?
Stars are just one signal among many.
The Bottom Line
The most-starred open source SaaS alternatives in 2026 represent a mature ecosystem. Projects like Supabase (73K), n8n (48K), and Cal.com (35K) aren't hobby projects — they're well-funded companies building production-grade software.
But don't sleep on lower-starred tools like GlitchTip, Documenso, and Zammad — they're often better fits for specific use cases.
Explore all open source alternatives ranked by quality, not just stars, at OSSAlt.