Best Open Core Open Source Tools in 2026

PostHog

Data & Analytics Product & Project Management Marketing & Growth

Track events, replay sessions, and run A/B tests, self-hostable

stars 34.5Klicense NOASSERTIONlang Python

Web Analytics A/B Testing Feature Flag+5

Rocket.Chat

Communication & Collaboration Customer Support IT Management

Self-hosted team chat with voice, video, and omnichannel support

stars 45.3Klicense NOASSERTIONlang TypeScript

Chat Self Hosted Customer Support+5

Bluesky

Communication & Collaboration Developer Tools

Own your account and move freely across compatible servers

stars 18Klicense MITlang TypeScript

Social Media Self Hosted Open Core+2

Notesnook

Business & Productivity Security & Monitoring Communication & Collaboration

End-to-end encrypted open source note-taking, cross-platform

stars 14Klicense GPL-3.0lang TypeScript

Note-taking Apps Privacy Tools Self Hosted+3

Tor Browser

Security & Monitoring Developer Tools IT Management

Anonymous browsing through the Tor network, no tracking

stars 859license MITlang Python

Web Browsers Privacy Tools Security+2

Brave

Business & Productivity Security & Monitoring

Block ads and trackers by default in a Chromium-based browser

stars 22.5Klicense MPL-2.0

Web Browsers Privacy Tools Security+2

LibreWolf

Business & Productivity Security & Monitoring

Privacy-hardened Firefox fork with all telemetry removed

stars 256license MPL-2.0lang Shell

Web Browsers Privacy Tools Security+1

Cody

AI & Machine Learning Developer Tools LLMOps & AI Tooling

Write and explain code using your full repository as AI context

stars 145lang TypeScript

AI Coding Assistant Developer Tools Coding+4

Logto

Security & Monitoring Developer Tools APIs & Integration

Multi-tenant auth platform with SSO, RBAC, and social login

stars 12Klicense MPL-2.0lang TypeScript

Authentication Authorization API Infrastructure+5

Turso

Databases & Storage Backend Development Cloud & Hosting

Edge SQLite database with multi-tenancy for serverless apps

stars 18.8Klicense MITlang Rust

Database Cloud Native Developer Tools+3

WorkAdventure

Communication & Collaboration Business & Productivity Web Development

Open source 2D virtual office with proximity-based video calling

stars 5.5Klang TypeScript

Chat Video Self Hosted+3

Horilla

Business & Productivity IT Management

All-in-one HRMS for recruitment, payroll, and leave management

stars 1.2Klicense LGPL-2.1lang HTML

Self Hosted Workflow Automation Open Core+2

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PostHog

Rocket.Chat

Bluesky

Notesnook

Tor Browser

Brave

LibreWolf

Cody

Logto

Turso

WorkAdventure

Horilla

PostHog

Rocket.Chat

Bluesky

Notesnook

Tor Browser

Brave