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Best AI Tools for Building ai agents (31 options)
31 tools for building AI agents in the directory. Frameworks, platforms and memory layers for building AI agents.
How to read this page. We do not rank tools or publish scores. This page lists every AI Agents & Frameworks tool in the directory with its official link and pricing model so you can shortlist, then try the ones that fit. Pricing labels come from each vendor's pricing page when we could confirm them; "See site" means we could not.
At a glance
- 31 tools listed; 9 free to use, 9 with a free tier, 0 paid, 13 where pricing is not confirmed here.
- With a free plan or tier: Agno, AutoGen, CAMEL-AI, Composio, CopilotKit, DSPy, Google Agent Development Kit, Haystack, LangChain, Letta, LlamaIndex, Mastra, OpenAI Agents SDK, Pydantic AI, Semantic Kernel, Sim, smolagents, Zep.
What to look for
Decide between a hosted product and a framework you run yourself, and check how each handles tool access, memory and monitoring.
All 31 tools
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| AgentOps | Observability and monitoring for AI agents. | See site | Official site |
| Agno | Framework and runtime for building multi-agent systems. | Freemium | Official site |
| Amazon Bedrock AgentCore | AWS services for deploying and operating AI agents at scale. | See site | Official site |
| AutoGen | Microsoft's open-source framework for building multi-agent applications. | Free | Official site |
| AutoGPT | Open-source platform for building and running autonomous AI agents. | See site | Official site |
| BeeAI | Open-source platform for discovering and running AI agents. | See site | Official site |
| CAMEL-AI | Open-source community and framework for multi-agent research. | Free | Official site |
| Composio | Tool integration platform that connects AI agents to apps and APIs. | Freemium | Official site |
| CopilotKit | Open-source framework for adding in-app AI copilots and agentic UIs. | Freemium | Official site |
| CrewAI | Framework and platform for orchestrating teams of role-playing AI agents. | See site | Official site |
| DSPy | Framework for programming rather than prompting language models. | Free | Official site |
| Google Agent Development Kit | Google's open-source toolkit for building and deploying AI agents. | Free | Official site |
| Griptape | Framework and cloud for building AI agents and workflows. | See site | Official site |
| Haystack | Open-source framework from deepset for building search, RAG and agent pipelines. | Free | Official site |
| LangChain | Open-source framework and company for building LLM-powered applications and agents. | Freemium | Official site |
| LangGraph | Framework for building stateful, controllable multi-step agents. | See site | Official site |
| Letta | Platform for building stateful agents with long-term memory. | Freemium | Official site |
| LlamaIndex | Framework and cloud services for building agents over your own data. | Freemium | Official site |
| Manus | General-purpose autonomous AI agent. | See site | Official site |
| Mastra | TypeScript framework for building AI agents and workflows. | Freemium | Official site |
| Mem0 | Memory layer for AI agents and applications. | See site | Official site |
| Microsoft Copilot Studio | Low-code platform for building custom copilots and agents. | See site | Official site |
| OpenAI Agents SDK | OpenAI's lightweight Python framework for multi-agent workflows. | Free | Official site |
| Pydantic AI | Python agent framework from the Pydantic team focused on type safety. | Free | Official site |
| Relevance AI | Platform for building and managing teams of AI agents without code. | See site | Official site |
| Salesforce Agentforce | Salesforce's platform for building and deploying AI agents on CRM data. | See site | Official site |
| Semantic Kernel | Microsoft's SDK for integrating AI models and agents into applications. | Free | Official site |
| Sim | Open-source visual builder for AI agent workflows. | Freemium | Official site |
| smolagents | Hugging Face's minimal library for building agents that write code. | Free | Official site |
| Vercel AI SDK | TypeScript toolkit for building AI-powered applications and agents. | See site | Official site |
| Zep | Context engineering and memory platform for AI agents. | Freemium | Official site |
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