Best Mastra alternatives
5 tools developers use instead of Mastra, ranked by popularity. 5 offer a free plan and 5 are open source. Updated October 2026.
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Open-source framework for building LLM applications, with integrations for over 100 model providers and a standard agent loop around create_agent.
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LangChain's graph-based runtime for stateful agents, modeling each step as a node with checkpointing at every super-step for time-travel debugging.
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Microsoft Research's early multi-agent framework for Python, now in maintenance mode since October 2025, limited to bug fixes from community contributors.
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Standalone Python framework for multi-agent systems, with no LangChain dependency, where agents get a role, a goal, and tools, then collaborate.
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Open-source data framework for RAG and agents over enterprise data, with 150-plus connectors through LlamaHub for sources like Notion and SQL.