Rubberduck – Open Source Tool to Emulate OpenAI/Anthropic APIs Locally

Visit github.com ↗Alternatives

Does the same job

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OpenAI Universe2016 · ▲329
Platform for measuring and training AI agents
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Vector: a Matrix-powered open-source collaboration Web/Android/iOS app2016 · vector.im · ▲186
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Stargate – An open source API framework for data2020 · stargate.io · ▲72
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AI-SDK-Cpp – Unified C++ SDK for OpenAI, Anthropic, and More2025 · github.com · ▲5
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An Open Source Version of OpenAI Assistants API2023 · twitter.com · ▲5
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Surf.new – An open-source alternative to OpenAI Operator2025 · surf.new · ▲9

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