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Best Open Source Developer Tools in 2026

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Codegen

stars 520forks 63

AI that reviews your code, fixes bugs, and implements features

AI Coding Assistant AI Agents Developer Tools+4

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Lightdash

stars 6Kforks 758

Self-serve BI for dbt projects with metric definitions

Data Visualization Web Analytics Developer Tools+4

Dendron

stars 7.5Kforks 303

Local-first Markdown notes with hierarchy and backlinks

Note-taking Apps Knowledge Management Developer Tools+3