Best Open Source Tools by Tag in 2026

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Open Source Alternatives

FFmpeg

stars 65.1Kforks 14.4K

Record, convert, and stream audio and video on any platform

Video Developer Tools Developer Framework+2

Concrete CMS

stars 852forks 488

Open source CMS designed for collaborative editorial teams

CMS Knowledge Management Workflow Automation+2

Flagsmith

stars 6.6Kforks 584

Open source feature flags and remote config, self-hosted

A/B Testing DevOps Tools CI/CD Platforms+4

GrowthBook

stars 8.5Kforks 876

Open source A/B testing and feature flag platform

A/B Testing Web Analytics Data Visualization+4

Pinta

stars 4.1Kforks 399

Free open source image editor inspired by Paint.NET

Graphic Design Open Core Developer Tools+1

OLMo

stars 1.7Kforks 345

Allen AI research LLM with public weights and open training code

LLM LLMOps AI SDK+4

JanusGraph

stars 5.9Kforks 1.2K

Distributed open source graph database for massive scale

Database Developer Tools Cloud Native+3

TiDB

stars 40.6Kforks 6.3K

MySQL-compatible distributed SQL database for elastic scale

Database Cloud Native DevOps Tools+2

Nhost

stars 9.4Kforks 634

Firebase alternative: GraphQL, Postgres auth, and file storage

BaaS Authentication Authorization+5

Dagster

stars 16.3Kforks 2.3K

Asset-based data pipeline orchestration with a built-in catalog

Workflow Orchestration Workflow Automation LLMOps+3

Appsmith

stars 41.1Kforks 4.8K

Build internal tools with a low-code drag-and-drop UI

Workflow Automation Developer Tools Self Hosted+3

KeePass

stars 55forks 7

Free open source password manager with encrypted local file

Security Authentication Authorization+4

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