Leon

Leon is an open-source personal assistant that runs on your own machine or server. It started in 2019 as a classic intent-based assistant and is being rebuilt around tools, context, memory and agent-style execution; the 2.0 Developer Preview lives on the develop branch, while the older, more stable version stays on master.

Leon has three modes: smart picks an approach for you, controlled follows deterministic skills and actions, and agent plans step by step. It supports native skills and SKILL.md-based agent skills, can use real tools and computer use on desktop and browser interfaces, and keeps layered memory of preferences and recent context. It works with local or remote AI providers, so you choose how much leaves your machine.

Leon is one of the longest-running open-source personal assistants, and its focus on local context and explicit tools over guesswork fits people who want an assistant they control. It's MIT-licensed. Version 2.0 is still a developer preview.

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leon-ai/leon

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