Lemonade is a local AI inference server that provides an OpenAI-compatible API for LLM chat, completions, embeddings, image generation, TTS, audio transcription, and 3D model generation. It features a multi-backend architecture supporting over 20 inference engines (llama.cpp, vLLM, Stable Diffusion, Kokoro, Moonshine, ONNX Runtime, etc.) with automatic model management, intelligent routing policies, and a desktop GUI built with Tauri and React. The system includes a CLI tool for model management and benchmarking, a web app for browser-based interaction, and extensive platform support (Linux, Windows, macOS, Docker). Key architectural patterns include a plugin-based backend system with declarative descriptors, a routing policy engine with classifier-based and deterministic rules, a streaming proxy for SSE forwarding, and platform abstraction layers for processes, paths, and system metrics. The codebase demonstrates high craftsmanship with well-isolated components, comprehensive testing, and attention to cross-platform compatibility. While primarily an application, it also includes data-oriented components such as model metadata extraction from GGUF files, benchmarking infrastructure, and telemetry collection for inference monitoring.