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AI Agent Builders & Frameworks

Platforms and frameworks for building your own AI agents and chatbots, from no-code builders to developer SDKs and orchestration libraries. For ready-made autonomous agents, see AI Agents; for bots you just talk to, see AI Chatbots.

27 tools·24 with free plan·9 with free trial
Read the editor's roundup →

Looking for ready-made autonomous agents instead? Browse AI Agents →

These are the tools you build with: no-code agent and chatbot builders, orchestration frameworks, and developer SDKs for wiring models to tools, memory, and workflows. It is the construction layer beneath the other two categories. If you want to use a finished agent rather than assemble one, see AI Agents; if you want a conversational assistant, see AI Chatbots.

27 tools reviewed24 with a free plan9 with a free trial25 with an API20 self-hostable2 paid-only

Where to start

Not enough community votes to rank this category yet — this is a shortlist, not an order of merit.

Agno logoAgno

High-performance Python framework for building multi-agent systems and AgentOS

A solid pick for quickly building performant Python agents and multi-agent teams with built-in memory and tools. The honest caveat is that the Phidata rebrand brought churn, and it is less battle-tested and less documented than heavier incumbents like LangChain.
freemium·$150/month
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AutoGen logoAutoGen

Microsoft's multi-agent conversation framework (now in maintenance mode).

AutoGen is genuinely influential in multi-agent design, but honesty requires flagging that Microsoft moved it into maintenance mode in early 2026 and now steers new work toward the merged Microsoft Agent Framework. Existing AutoGen apps keep working and getting bug fixes, and it remains a fine way to learn multi-agent patterns, but teams starting fresh should seriously evaluate the successor framework before committing.
free·Free (open source)
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Botpress logoBotpress

An all-in-one platform for building and deploying LLM-powered AI agents.

Botpress is now a cloud-first platform for building and shipping LLM-powered AI agents, and that is where its value sits today. You get a visual studio, knowledge bases, and multi-channel deployment across web, WhatsApp, Slack, and Telegram, backed by roughly 40 million dollars in funding. Watch the cost model: cloud plans bill AI model usage (AI Spend) separately from the monthly plan fee, and message overages stack on top, so map your real monthly spend before scaling. One thing to know plainly: Botpress v12 and every self-hosted or locally installed version are now officially sunset. They are no longer sold, downloadable, or open to new deployments, and v12 no longer receives feature updates or security patches. The legacy v12 code stays on GitHub under an MIT license and its Docker image still runs for hobby or internal use, but it is not recommended for production. New teams should build on Botpress Cloud.
freemium·$89/mo
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All Agent Builders & Frameworks

CAMEL-AI logo
CAMEL-AI

Open-source multi-agent framework for data generation, world simulation, and automation

#multi-agent#open-source#synthetic-data#simulation 2 views
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Chatbase logo
Chatbase

Build AI support agents trained on your own data, no code required.

#ai-chatbot#customer-support#no-code#rag 4 views
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Cognigy (NiCE Cognigy) logo
Cognigy (NiCE Cognigy)

Enterprise agentic AI platform for building voice and chat customer service agents

#conversational-ai#agentic-ai#contact-center#enterprise 1 views
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Coze logo
Coze

ByteDance's no-code studio for building and publishing AI chatbots and agents

#no-code#chatbot builder#rag#agents 3 views
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CrewAI logo
CrewAI

CrewAI is an open-source framework for orchestrating multi-agent AI workflows, offering both a visual no-code editor and CLI for developers

#write-code#automate-workflows 2 views
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CustomGPT.ai logo
CustomGPT.ai

No-code custom AI agents built from your business content, with anti-hallucination focus.

#ai-agents#rag#no-code#customer-support 3 views
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Dify logo
Dify

Open-source platform for building production-ready LLM apps and agents.

#llmops#open-source#ai-agents#rag 3 views
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DSPy logo
DSPy

Framework for programming language models instead of prompting them

#prompt-optimization#llm-programming#rag#open-source 2 views
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Griptape logo
Griptape

Modular Python framework for building secure AI agents and workflows

#python-framework#ai-agents#rag#workflows 1 views
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Haystack logo
Haystack

deepset's composable open-source framework for RAG and agent pipelines.

#rag#llm-framework#open-source#search 1 views
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Inngest AgentKit logo
Inngest AgentKit

TypeScript multi-agent networks with deterministic routing and MCP

#typescript#multi-agent#orchestration#mcp 2 views
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Julep logo
Julep

Serverless platform for durable, composable AI agents and workflows

#serverless#durable-workflows#ai-agents#temporal 1 views
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Landbot logo
Landbot

A no-code builder for conversational chatbots and AI agents.

#chatbot-builder#no-code#whatsapp#lead-generation 1 views
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Langflow logo
Langflow

Langflow is an open-source, low-code visual builder for creating AI agents, RAG applications, and MCP servers

#write-code#automate-workflows 2 views
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LangGraph logo
LangGraph

Graph-based orchestration for stateful, controllable LLM agents.

#agents#orchestration#llm-framework#open-source 5 views
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Letta logo
Letta

Stateful AI agents with long-term memory (formerly MemGPT).

#agents#memory#open-source#stateful-agents 2 views
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Mastra logo
Mastra

The TypeScript framework for building AI agents and workflows.

#agents#typescript#open-source#workflow 1 views
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Mastra Factory logo
Mastra Factory

Agent-run software delivery that takes an issue from triage to reviewed pull request

#agentic sdlc#coding agents#pull requests#open source 1 views
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Pydantic AI logo
Pydantic AI

Type-safe Python agent framework from the team behind Pydantic

#python#ai-agents#type-safety#structured-output 2 views
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Semantic Kernel logo
Semantic Kernel

Microsoft's enterprise SDK for orchestrating LLMs, plugins, and agents.

#llm-framework#agents#open-source#microsoft 4 views
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SiteGPT logo
SiteGPT

A personalized AI support chatbot trained on your website and docs.

#ai-chatbot#customer-support#no-code#rag 2 views
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smolagents logo
smolagents

A barebones open-source library for agents that think in code

#ai-agents#open-source#code-agents#hugging-face 1 views
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Stack AI logo
Stack AI

A no-code platform to build and deploy enterprise AI agents.

#ai-agents#no-code#enterprise#workflow-automation 2 views
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VoltAgent logo
VoltAgent

Observability-first open-source TypeScript framework for AI agents

#typescript#agents#open-source#observability 2 views
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Other AI tool categories

Writing & ContentAI Image GenerationCoding & DevAI Video GenerationProductivityResearch & DataAI ChatbotsAI SEO Tools

Frequently asked questions

What's the best agent builders & frameworks tool?
Agno currently leads in community votes. A solid pick for quickly building performant Python agents and multi-agent teams with built-in memory and tools. The honest caveat is that the Phidata rebrand brought churn, and it is less battle-tested and less documented than heavier incumbents like LangChain.
Are there free options?
24 tools in this category offer a free plan. Another 9 have a free trial.
How do you rank these tools?
Tools are ranked by a combination of community upvotes, editorial review, and feature breadth. Our editors review pricing and capabilities quarterly.
Can I suggest a tool we're missing?
Yes — submit it here. Our team reviews submissions weekly.