Open Policy Agent (OPA) is an open source, general-purpose policy engine.
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 12k
- Latest
- v1.21.1
- Last push
- 2026-10-06
Authorization services
Decide who may do what in an application, with policies or relationship-based permissions served over an API.
Changes in this category (RSS)
Side by side
| Tool | Stars | Licence | Terms | Self-hosted | Language | Latest | Last push |
|---|---|---|---|---|---|---|---|
| Open Policy Agent | 12k | Apache-2.0 | Open source | Yes | Go | v1.21.1 | 2026-10-06 |
| SpiceDB | 7.1k | Apache-2.0 | Open source | Yes | Go | v1.56.2 | 2026-10-06 |
| Permify | 6k | AGPL-3.0 | Open source | Yes | Go | v1.7.4 | 2026-10-06 |
| OpenFGA | 5.9k | Apache-2.0 | Open source | Yes | Go | v1.21.0 | 2026-10-06 |
| Ory Keto | 5.4k | Apache-2.0 | Open source | Yes | Go | v26.2.0 | 2026-09-04 |
| Cerbos | 4.6k | Apache-2.0 | Open source | Yes | Go | v0.56.0 | 2026-10-06 |
| Topaz | 1.4k | Apache-2.0 | Open source | Yes | Go | v0.33.22 | 2026-09-30 |
7 tools
Open Source, Google Zanzibar-inspired database for scalably storing and querying fine-grained authorization data
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 7.1k
- Latest
- v1.56.2
- Last push
- 2026-10-06
An open-source authorization as a service inspired by Google Zanzibar, designed to build and manage fine-grained and scalable authorization systems for any application. — Permify is now part of FusionAuth 🎉
A high-performance and flexible authorization/permission engine built for developers and inspired by Google Zanzibar.
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 5.9k
- Latest
- v1.21.0
- Last push
- 2026-10-06
The most scalable and customizable permission server on the market. Fix your slow or broken permission system with Google's proven "Zanzibar" approach. Supports ACL, RBAC, and more. Written in Go, cloud native, headless, API-first. Available as a service on Ory Network and for self-hosters.
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 5.4k
- Latest
- v26.2.0
- Last push
- 2026-09-04
Cerbos is an open-core authorization management platform for authorizing every identity and governing every action across applications, gateways, workloads, and AI agents.
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 4.6k
- Latest
- v0.56.0
- Last push
- 2026-10-06
Cloud-native authorization for modern applications and APIs
- Language
- Go
- Licence
- Apache-2.0
- Stars
- 1.4k
- Latest
- v0.33.22
- Last push
- 2026-09-30