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Open Source Tools (2026)
Open source software tools with transparent code that you can inspect, modify, and self-host. Perfect for security-conscious teams and developers.
By Louis Corneloup · Updated Benefits of Open Source
Full code transparency
Community-driven development
No vendor lock-in
Customization freedom
Common Use Cases
- Developer teams
- Security-conscious organizations
- Budget-limited startups
- Educational purposes
22 tools with Open Source
n8n
Workflow automation for technical teams
Free plan 4.7 · 305 ratings across SourceForge and G2, Sep 2026
Supabase
Open source Firebase alternative
Free plan 4.6 · 233 ratings across G2 and Capterra, Sep 2026
GitLab
The most comprehensive AI-powered DevSecOps platform for secure and accelerated software delivery.
Free plan 4.5 · 875 ratings on G2, Mar 2026
Mattermost
Open-source team collaboration platform
Free plan 4.3 · 604 ratings across SourceForge, G2 and Capterra, Sep 2026
Plausible
Privacy-first website analytics, GDPR compliant by default
Paid
Umami
Privacy-first, self-hosted web analytics without cookie banners
Free plan 4.5 · 5 ratings on G2, Sep 2026
Matomo
Open-source web analytics alternative to GA
Free plan 4.4 · 158 ratings across G2 and Capterra, Sep 2026
PostHog
Open-source product analytics with event tracking, feature flags, and session recording
Free plan 4.5 · 1,054 ratings on G2, Aug 2026
Cal.com
Open-source scheduling infrastructure you can customize and own
Free plan 4.6 · 154 ratings on G2, Aug 2026
Appwrite
Open-source backend for web, mobile, and Flutter. Self-host or cloud
Free plan 4.4 · 5 ratings across G2 and Capterra, Sep 2026
Directus
Open-source headless CMS and data platform
Free plan 4.9 · 52 ratings on G2, Aug 2026
Strapi
Build content APIs fast with a customizable, self-hosted headless CMS
Free plan 4.5 · 272 ratings across G2 and Capterra, Sep 2026
Ghost
Professional publishing platform
Free plan 3.9 · 264 ratings across G2, Capterra and SourceForge, Sep 2026
WordPress
Build any site, from blogs to e-commerce, with a flexible CMS
100% free 3.5 · 9,793 ratings across Trustpilot and G2, Sep 2026
Nextcloud
Open source content collaboration platform for secure, self-hosted data control and remote teamwork.
Free plan 4.5 · 645 ratings across G2 and Capterra, Sep 2026
Bitwarden
Open-source password manager for secure, cross-device vault sync
Free plan 4.6 · 1,659 ratings across G2 and Capterra, Sep 2026
Telegram
A cloud-based mobile and desktop messaging app focused on security and speed.
100% free 3.4 · 7,071 ratings across Capterra and Trustpilot, Sep 2026
iTerm2
The macOS terminal replacement for power users
100% free 4.7 · 51 ratings on G2, Aug 2026
Metabase
Business intelligence for everyone
Free plan 4.4 · 209 ratings across G2 and Capterra, Sep 2026
Redash
Open-source data visualization and dashboards
Free plan 4.3 · 44 ratings on G2, Sep 2026
OpenClaw
Your private AI assistant for apps, tasks, and browser control
100% free