llama.cpp
Lightweight C++ implementation of LLaMA for running LLMs locally and efficiently.
The free, foundational engine for local LLMs; unbeatable on cost and portability, but a developer tool rather than a polished app.
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An open-source C/C++ inference engine for running LLMs locally with minimal setup - the substrate beneath Ollama, LM Studio and much of the local-AI ecosystem. It is free, not a subscription.
It is the de-facto standard for local LLM inference: a dependency-free binary, GGUF quantized models, broad hardware support (CPU, NVIDIA, AMD, Apple, Intel) and an OpenAI-compatible server. It is completely free under MIT, with the trade-off that it is a developer/CLI tool - you compile or grab binaries and manage models yourself.
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Alternatives
vLLM - higher-throughput GPU serving for production workloads.
Ollama or LM Studio - friendlier wrappers over llama.cpp with one-command runs and GUIs.
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