Best Security Open Source Tools in 2026

ToolJet

Web & App Development AI & Machine Learning Business & Productivity+1

Build internal tools with a drag-and-drop UI and 50+ connectors

stars 37.8Klicense AGPL-3.0lang JavaScript

No Code AI Agents LLM+10

Matrix

Communication & Collaboration Web & App Development IT Management+1

Open protocol for secure, decentralized messaging and VoIP

stars 12.1Klicense Apache-2.0lang Python

Chat Security WebSocket Servers+11

Element

Communication & Collaboration Security & Monitoring IT Management+1

Secure team chat built on the Matrix open protocol

stars 13Klicense AGPL-3.0lang TypeScript

Chat File Sharing Security+8

Tox

Communication & Collaboration Security & Monitoring

Free encrypted P2P messaging and voice calls, no servers

stars 2.6Klicense GPL-3.0lang C

Chat Security File Sharing+2

Jami

Communication & Collaboration Security & Monitoring

Free P2P encrypted messaging, calls, and file sharing

stars 165license GPL-3.0lang C++

Chat File Sharing Security+7

Tinode

Communication & Collaboration Web & App Development IT Management

Self-hosted instant messaging platform for web and mobile apps

stars 13.3Klicense GPL-3.0lang Go

Chat WebSocket Servers Self Hosted+7

Jitsi

Free video conferencing you can self-host with no account needed

stars 29.1Klicense Apache-2.0lang TypeScript

Video Self Hosted Open Core+3

Mumble

Communication & Collaboration IT Management

Free open source low-latency voice chat for gaming teams

stars 8Klicense NOASSERTIONlang C++

Self Hosted Open Core Security+4

SigNoz

Security & Monitoring Product & Project Management Data & Analytics+2

Open source APM with logs, traces, metrics, and dashboards

stars 26.7Klicense NOASSERTIONlang TypeScript

Monitoring Self Hosted Open Core+19

Mullvad Browser

Security & Monitoring Web & App Development

Privacy browser built with the Tor Project to minimize tracking

stars 2.2Klang Shell

Web Browsers Security Cybersecurity+1

Trench

Data & Analytics Web & App Development IT Management

Open source analytics infrastructure powered by ClickHouse

stars 1.6Klicense MITlang TypeScript

Web Analytics Self Hosted Database+9

Anytype

Business & Productivity Security & Monitoring Communication & Collaboration+3

Local-first self-hosted alternative to Notion and Linear

stars 7.4Klicense NOASSERTIONlang TypeScript

Note-taking Apps File Sync & Storage Self Hosted+13

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