Best Authentication Open Source Tools in 2026

Kuzzle

Web & App Development IT Management AI & Machine Learning+1

Self-hosted backend with real-time API and search built in

stars 1.6Klicense Apache-2.0lang JavaScript

Developer Framework BaaS API Development Tools+9

Encore

Web & App Development AI & Machine Learning

Auto-generate infrastructure from your TypeScript or Go code

stars 11.9Klicense MPL-2.0lang Go

Developer Framework Developer Tools API Development Tools+12

Flotilla Social

Web & App Development Business & Productivity

Decentralized social platform with user-owned content

stars 74

Social Media Web3 Self Hosted+6

KeePassXC

Security & Monitoring Business & Productivity IT Management

Cross-platform open source password manager with browser plugin

stars 26.8Klicense NOASSERTIONlang C++

Security Privacy Tools Authentication+4

Svix

Web & App Development IT Management Product & Project Management+4

Webhook platform with delivery guarantees, retries, and signing

stars 3.2Klicense MITlang Rust

API Infrastructure Developer Tools Authentication+12

Amplication

Web & App Development IT Management Business & Productivity+1

Generate production-ready backends for platform engineers

stars 16Klicense NOASSERTIONlang TypeScript

Developer Tools API Development Tools BaaS+13

Manifest

Web & App Development AI & Machine Learning Business & Productivity

One YAML file gives your app auth, CRUD, storage, and admin UI

stars 5.7Klicense MITlang TypeScript

Developer Tools AI Coding Assistant Self Hosted+10

Passbolt

Security & Monitoring Communication & Collaboration Business & Productivity+1

Open source team password manager with sharing and audit

stars 1.1Klicense AGPL-3.0lang Shell

Security Cybersecurity Authentication+9

Warrant

Web & App Development Security & Monitoring IT Management

Add RBAC, ABAC, and ReBAC to any app via API and SDK

stars 17license MITlang Go

Authorization API Infrastructure Developer Tools+7

Adapt

Communication & Collaboration

Lightweight self-hosted messaging platform for teams

stars 1license AGPL-3.0

Chat Self Hosted Open Core+4

Psono

Security & Monitoring IT Management Business & Productivity

Self-hosted password manager for teams with enterprise SSO

stars 98license NOASSERTIONlang Python

Self Hosted Open Core Cybersecurity+9

Oso Cloud

Security & Monitoring Web & App Development AI & Machine Learning

Open source authorization with RBAC, ABAC, and ReBAC for any app

stars 3.5Klicense Apache-2.0lang Rust

Authorization Security Developer Tools+8

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