Awesome open-source alternatives to SaaS

Awesome list of open-source startup alternatives to established SaaS products. Maintained by folks at

Also checkout our ROSS index: fastest-growing open-source startups, every quarter.

Criteria

Open-source company is added to the list if:

Its product is strongly based on an open-source repo
It has a well-known closed-source competitor, solving a similar business problem
It is a private for-profit company, founded in the last 10 years
Its repo has 100+ stars on GitHub

Things change really fast in the startup world, so this list can neither be fully complete, nor 100% up to date.

Don't hesitate to contribute and add new startups. Let's build the most comprehensive list together.

Any questions or suggestions? Feel free to DM project maintainer @garrrikkotua

Startup List

All startups in the list are sorted by categories and sorted in alphabetical order. If you click on the stars badge you will get to the product's repo. Have a good search!

Category	Company	Description	GitHub Stars	Alternative to
API Gateway	Apache APISIX	Cloud Native API Gateway under the Apache Software Foundation	<a href=https://github.com/apache/apisix><img src="https://img.shields.io/github/stars/apache/apisix?style=social" width=150/></a>	apigee
API Platform	Firecamp	DX first open-source API devtool	<a href=https://github.com/firecamp-dev/firecamp><img src="https://img.shields.io/github/stars/firecamp-dev/firecamp?style=social" width=150/></a>	Postman
API Platform	Fusio	API management platform	<a href=https://github.com/apioo/fusio><img src="https://img.shields.io/github/stars/apioo/fusio?style=social" width=150/></a>	Postman
API Platform	Hoppscotch	API development ecosystem	<a href=https://github.com/hoppscotch/hoppscotch><img src="https://img.shields.io/github/stars/hoppscotch/hoppscotch?style=social" width=150/></a>	Postman
API Platform	Keploy	e2e Testing and Data Mocking	<a href=https://github.com/keploy/keploy><img src="https://img.shields.io/github/stars/keploy/keploy?style=social" width=150/></a>	Smartbear, Newman
API Platform	Step CI	API Testing and Monitoring	<a href=https://github.com/stepci/stepci><img src="https://img.shields.io/github/stars/stepci/stepci?style=social" width=150/></a>	Checkly, Postman
Auth & SSO	BoxyHQ	Enterprise Readiness made simple	<a href=https://github.com/boxyhq/jackson><img src="https://img.shields.io/github/stars/boxyhq/jackson?style=social" width=150/></a>	Auth0
Auth & SSO	Cerbos	Granular access control	<a href=https://github.com/cerbos/cerbos><img src="https://img.shields.io/github/stars/cerbos/cerbos?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	FusionAuth	User authentication and session management framework	<a href=https://github.com/FusionAuth/fusionauth-containers><img src="https://img.shields.io/github/stars/FusionAuth/fusionauth-containers?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Hanko	Passkey-first authentication framework	<a href=https://github.com/teamhanko/hanko><img src="https://img.shields.io/github/stars/teamhanko/hanko?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Keycloak	User authentication and session management framework	<a href=https://github.com/keycloak/keycloak><img src="https://img.shields.io/github/stars/keycloak/keycloak?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	OPAL (Permit.io)	Authorization administration framework (Open Policy)	<a href=https://github.com/permitio/opal><img src="https://img.shields.io/github/stars/permitio/opal?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Ory	Identity platform	<a href=https://github.com/ory/kratos><img src="https://img.shields.io/github/stars/ory/kratos?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Oso	Authorization building framework	<a href=https://github.com/osohq/oso><img src="https://img.shields.io/github/stars/osohq/oso?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Supertokens	User authentication and session management framework	<a href=https://github.com/supertokens/supertokens-core><img src="https://img.shields.io/github/stars/supertokens/supertokens-core?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Warrant	Authorization and access control as a service	<a href=https://github.com/warrant-dev/warrant><img src="https://img.shields.io/github/stars/warrant-dev/warrant?style=social" width=150/></a>	Okta, Auth0
Auth & SSO	Zitadel	User authentication and session management framework	<a href=https://github.com/zitadel/zitadel><img src="https://img.shields.io/github/stars/zitadel/zitadel?style=social" width=150/></a>	Okta, Auth0
Backend as a service	AceBase	Backend server with REST APIs to manage core backend needs	<a href=https://github.com/appy-one/acebase><img src="https://img.shields.io/github/stars/appy-one/acebase?style=social" width=150/></a>	Firebase
Backend as a service	Amplication	Backend server with REST and GraphQL APIs to manage core backend needs	<a href=https://github.com/amplication/amplication><img src="https://img.shields.io/github/stars/amplication/amplication?style=social" width=150/></a>	Firebase
Backend as a service	Appwrite	Backend server with REST APIs to manage core backend needs	<a href=https://github.com/appwrite/appwrite><img src="https://img.shields.io/github/stars/appwrite/appwrite?style=social" width=150/></a>	Firebase
Backend as a service	CASE	Lightweight Backend-as-a-Service with essential features	<a href=https://github.com/casejs/case><img src="https://img.shields.io/github/stars/casejs/case?style=social" width=150/></a>	Firebase
Backend as a service	Encore	Backend Development Engine for cloud-based apps, APIs, and distributed systems	<a href=https://github.com/encoredev/encore><img src="https://img.shields.io/github/stars/encoredev/encore?style=social" width=150/></a>	Firebase
Backend as a service	Kuzzle	Backend server with REST APIs to manage core backend needs	<a href=https://github.com/kuzzleio/kuzzle><img src="https://img.shields.io/github/stars/kuzzleio/kuzzle?style=social" width=150/></a>	Firebase
Backend as a service	Nhost	Backend server with GraphQL	<a href=https://github.com/nhost/nhost><img src="https://img.shields.io/github/stars/nhost/nhost?style=social" width=150/></a>	Firebase
Backend as a service	PocketBase	Backend server with REST APIs to manage core backend needs	<a href=https://github.com/pocketbase/pocketbase><img src="https://img.shields.io/github/stars/pocketbase/pocketbase?style=social" width=150/></a>	Firebase
Backend as a service	Supabase	Backend server with REST APIs to manage core backend needs	<a href=https://github.com/supabase/supabase><img src="https://img.shields.io/github/stars/supabase/supabase?style=social" width=150/></a>	Firebase
Business Intelligence	Metabase	Business intelligence software	<a href=https://github.com/metabase/metabase><img src="https://img.shields.io/github/stars/metabase/metabase?style=social" width=150/></a>	Tableau, Power BI, DataStudio
Business