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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.

29 tools·26 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.

29 tools reviewed26 with a free plan9 with a free trial27 with an API22 self-hostable2 paid-only

Top picks

01

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

A developer framework for orchestrating multi-agent workflows — powerful for builders, but it's a toolkit, not a no-code product.

freemium·$25/mo

02

Flowise is an open-source visual builder for creating LLM applications and AI agents using a drag-and-drop interface

A genuinely handy open-source, drag-and-drop builder for LLM apps and RAG pipelines, great for prototyping chains and agents without much code. The honest limit is that visual flows get unwieldy for complex logic, and production hardening still falls on you.

freemium·$35/mo

03

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

Gives you a visual canvas for assembling LangChain-style flows, which speeds up prototyping RAG and agent pipelines and helps you learn the components. The caveat is it inherits LangChain abstraction churn, and the node interface can become clunky once your logic outgrows simple graphs.

freemium·$5/mo

All Agent Builders & Frameworks

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

#llmops#open-source#ai-agents#rag 1 views

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

#ai-chatbot#customer-support#no-code#rag 1 views

A collaborative platform to design, build and ship AI agents.

#ai-agents#conversational-ai#voice-ai#no-code 1 views

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

#ai-agents#chatbot-builder#open-source#llm

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

#chatbot-builder#no-code#whatsapp#lead-generation

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

#ai-chatbot#customer-support#no-code#rag 1 views

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

#ai-agents#rag#no-code#customer-support 1 views

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

#ai-agents#no-code#enterprise#workflow-automation

Graph-based orchestration for stateful, controllable LLM agents.

#agents#orchestration#llm-framework#open-source 1 views

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

#agents#multi-agent#open-source#microsoft 1 views

Semantic Kernel

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

#llm-framework#agents#open-source#microsoft 2 views

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

#rag#llm-framework#open-source#search

The TypeScript framework for building AI agents and workflows.

#agents#typescript#open-source#workflow

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

#agents#memory#open-source#stateful-agents 1 views

Type-safe Python agent framework from the team behind Pydantic

#python#ai-agents#type-safety#structured-output 1 views

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

#multi-agent#python#agentops#rag

Cognigy (NiCE Cognigy)

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

#conversational-ai#agentic-ai#contact-center#enterprise

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

#multi-agent#open-source#synthetic-data#simulation 1 views

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

#no-code#chatbot builder#rag#agents 1 views

Modular Python framework for building secure AI agents and workflows

#python-framework#ai-agents#rag#workflows

Serverless platform for durable, composable AI agents and workflows

#serverless#durable-workflows#ai-agents#temporal

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

#ai-agents#open-source#code-agents#hugging-face 1 views

Framework for programming language models instead of prompting them

#prompt-optimization#llm-programming#rag#open-source 1 views

Observability-first open-source TypeScript framework for AI agents

#typescript#agents#open-source#observability 1 views

Inngest AgentKit

TypeScript multi-agent networks with deterministic routing and MCP

#typescript#multi-agent#orchestration#mcp 1 views

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

#agentic sdlc#coding agents#pull requests#open source

Other AI tool categories

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Frequently asked questions

What's the best agent builders & frameworks tool?: CrewAI currently leads in community votes. A developer framework for orchestrating multi-agent workflows — powerful for builders, but it's a toolkit, not a no-code product.
Are there free options?: 26 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.