Open Source Alternatives

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Handpicked Open Source Alternatives to Paid Softwares

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Open Source Alternatives

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Open SourceAlternatives

Best Open Source Tools by Tag in 2026

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Warrant

Alternative toWorkOS FGA

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

1,335 GitHub stars
Licence Apache-2.0

Adapt

Alternative toSlack

Lightweight self-hosted messaging platform for teams

13 GitHub stars
Licence AGPL-3.0
#Chat

Moxin-LLM

Alternative toOpenAI API

Full transparency LLM: open weights, training code, and data

525 GitHub stars
Licence Apache-2.0
#LLM

Psono

Alternative to1Password

Self-hosted password manager for teams with enterprise SSO

110 GitHub stars
#Security

dyrector.io

Alternative toOctopus Deploy

Open source container management and CD platform

1,844 GitHub stars
Licence Apache-2.0

Kdenlive

Alternative toAdobe Premiere Pro

Free non-linear video editor for Linux, Mac, and Windows

5,907 GitHub stars
Licence GPL-3.0
#Video

Focalboard

Alternative toTrello

Open source project management: Kanban, Scrum, and lists

26,518 GitHub stars

Cinny

Alternative toElement

Elegant open source Matrix client for self-hosted chat

3,940 GitHub stars
Licence AGPL-3.0
#Chat

Keploy

Alternative toPostman

AI-powered tool that converts API traffic into test cases

18,658 GitHub stars
Licence Apache-2.0
#Testing

Oso Cloud

Alternative toPermit.io

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

3,488 GitHub stars
Licence Apache-2.0

Quiet

Alternative toSlack

Peer-to-peer serverless chat app with no central server

2,659 GitHub stars
Licence GPL-3.0
#Chat

Manticore Search

Alternative toElasticsearch Service (Elastic Cloud)

MySQL-wire search engine with full-text and real-time indexing

12,064 GitHub stars
Licence GPL-3.0
#Database

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