ElizaOS

ElizaOS is an open-source agent framework that positions itself as an 'agentic operating system' rather than a single chatbot library. It ships a unified message bus that normalizes events across Discord, Telegram, X (Twitter), HTTP, and onchain transports, plus a plugin architecture where every capability — model provider, vector store, social adapter, custom action — arrives as an npm package. Out of the box you can compose 'Worlds' and 'Rooms' for multi-agent coordination, chain tool calls into branching workflows, and swap LLM backends without rewriting your agent.

It is aimed at developers building autonomous systems: AI influencers, trading bots, customer-support swarms, NPCs, devops agents, and crypto-native automation. The framework is free and self-hosted (no SaaS pricing on the landing page), with a sizeable community — 5,000+ forks and 1,300+ contributors — and 200+ community plugins. ElizaOS rose to prominence in the crypto-AI agent wave, so much of the ecosystem leans toward onchain use cases, though the core runtime is model- and domain-agnostic.

Because everything is Node.js and npm-based, integrating new model providers (OpenAI, Anthropic, local Llama, OpenRouter) or vector stores is a matter of installing a plugin. The trade-off is that this is a framework, not a managed platform: you bring your own hosting, keys, and observability. Teams that want a no-code agent builder should look elsewhere.