Authorization Open Source Tools

Alternative toKong Konnect

Unified API keys, gateways, and observability for developers.

• 5,471 GitHub stars
• FSL-1.1-ALv2Licence FSL-1.1-ALv2

Alternative toPlainID

Move access control out of app code into testable YAML policies

• 4,627 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toPermit.io

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

• 3,488 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toSlack

Self-hosted web-based XMPP chat client for any server

• 3,301 GitHub stars
• MPL-2.0Licence MPL-2.0
• #Chat

Alternative toThreema Work

Free encrypted P2P messaging and voice calls, no servers

• 2,696 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toApigee

Build, document, and monetize APIs from one self-hosted platform

• 2,127 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toFirebase

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

• 1,668 GitHub stars
• Apache-2.0Licence Apache-2.0
• #BaaS

Alternative toWorkOS FGA

Run fine-grained authorization with RBAC, ABAC, and ReBAC

• 1,335 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toDocuSign

Open source e-signature platform for PDF signing and forms

• 834 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Security

Alternative toZenity

Runtime guardrails that gate every AI agent tool call

• 282 GitHub stars
• Apache-2.0Licence Apache-2.0