Best Security Open Source Tools in 2026

PostgreSQL

Data & Analytics Web & App Development IT Management

World's most advanced open source relational database

stars 20.7Klicense NOASSERTIONlang C

Database Open Core Self Hosted+3

Stirling PDF

Business & Productivity Security & Monitoring Web & App Development+1

Self-hosted PDF editor with 50+ tools for every PDF task

stars 77.9Klicense NOASSERTIONlang TypeScript

Self Hosted Developer Tools Workflow Automation+4

LibreSign

Security & Monitoring Business & Productivity

Open source e-signature platform for PDF signing and forms

stars 757license AGPL-3.0lang PHP

Security Authentication Authorization+4

ProjectDiscovery

Security & Monitoring Web & App Development IT Management+1

Open source security tools for finding vulnerabilities at scale

stars 28.1Klicense MITlang Go

Developer Tools DevOps Tools Cybersecurity+18

Matano

Security & Monitoring Data & Analytics IT Management

Open source cloud-native SIEM on a security data lake

stars 1.7Klicense Apache-2.0lang Rust

Security Cloud Native Cybersecurity+2

Grafana

Security & Monitoring Data & Analytics Web & App Development+2

Open source dashboards for metrics, logs, and traces

stars 2.9Klicense Apache-2.0lang Go

Data Visualization Monitoring Testing+10

Falkon

Web & App Development

Speed-first browser for KDE Plasma with built-in ad blocking

stars 460license GPL-3.0lang C++

Web Browsers Privacy Tools Self Hosted+2

Iridium Browser

Security & Monitoring Web & App Development Business & Productivity

Chromium-based browser with enhanced privacy and security

stars 411license BSD-3-Clause

Web Browsers Security Cybersecurity+2

Waterfox

Web & App Development Security & Monitoring Business & Productivity

Privacy-focused browser engineered for speed and user control

stars 5.7Klicense NOASSERTIONlang JavaScript

Web Browsers Security Cybersecurity+1

VictoriaMetrics

Security & Monitoring Data & Analytics IT Management+1

High-performance self-hosted time series database and metrics

stars 16.9Klicense Apache-2.0lang Go

Monitoring Database Data Visualization+7

Concrete CMS

Web & App Development Business & Productivity Communication & Collaboration+2

Open source CMS designed for collaborative editorial teams

stars 828license MITlang PHP

CMS Website Builder Knowledge Management+9

Flagsmith

Web & App Development Product & Project Management IT Management+1

Open source feature flags and remote config, self-hosted

stars 6.3Klicense BSD-3-Clauselang Python

Feature Flag A/B Testing Developer Tools+10

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PostgreSQL

Stirling PDF

LibreSign

ProjectDiscovery

Matano

Grafana

Falkon

Iridium Browser

Waterfox

VictoriaMetrics

Concrete CMS

Flagsmith

PostgreSQL

Stirling PDF

LibreSign

ProjectDiscovery

Matano

Grafana