Top 7 Free AI Agent Frameworks [2025]

Faster deployment with less repetitive work

According to McKinsey’s 2024 AI report, 65% of companies now use generative AI regularly, but many still hit bottlenecks when it comes to actually shipping use cases.

Teams trying to build their infrastructure around AI models — managing inputs, outputs, chaining logic, and API calls manually — are 1.5× more likely to spend five months or more getting those systems into production.

AI agent frameworks solve this by standardizing the boring but necessary setup work. Instead of stitching together every integration or toolchain from scratch, teams can plug into a shared framework that handles it cleanly. 

Reusable logic for easier scaling across agents

When using AI agent frameworks, a lot of what seems “intelligent” boils down to modular, composable steps that can be reused across different agents or flows.

When that logic lives inside a clean framework in form of units, it becomes just as simple to call as  add(2,3)  in Python.

AI agent frameworks give developers the freedom to think from first principles — to solve user problems with intuition, without rebuilding the same reasoning patterns over and over.

Instead of trying to perfectly standardize all logic upfront, teams can work more like product designers: test, adapt, reuse what works, and scale it out across use cases.

Shared frameworks make team collaboration manageable

When AI agents run on shared infrastructure — cloud platforms or server inferences — the framework they’re built on directly shapes how teams can collaborate.

Frameworks help by making collaboration visible and controlled. Think of it like managing a shared Google Sheet for agent behavior:

• Defined logic ownership — everyone knows who owns which part of the agent
• Safe updates — reasoning, tools, and memory can be changed without conflicts
• Auditable changes — edits to flows and configs are versioned and trackable
• Cross-team clarity — non-devs can inspect how the agent works without reading code

1. Botpress

Best for: Teams building AI agents that connect to tools, with LLM-powered steps for reasoning, decision-making, or language understanding.

Botpress is an AI agent platform built for teams that want to structure agent behavior without managing code-heavy logic.

You design how the agent works using flows — a visual editor where each node handles a focused task, with its memory, conditions, and tool connections.

Instead of writing chained prompts or logic trees, you work with scoped, modular pieces that reflect real workflows.

This modularity is especially useful when you want reliable automation across support, onboarding, or internal systems, with clear logic and clean permissions baked in.

Botpress comes with built-in integrations for tools like CRMs, email, and databases, so your agent can take real actions out of the box.

Key Features:

• Build workflows visually with a drag-and-drop interface.
• Add custom tools and logic when needed.
• Deploy agents on websites, WhatsApp, Slack, and more.
• Use built-in NLU, knowledge sources, and personality controls.

Pricing:

• Free Plan: Includes core builder, 1 bot, and $5 AI credit
• Plus: $89/month — flow testing, routing, human handoff
• Team: $495/month — SSO, collaboration, shared usage tracking
• Enterprise: Custom — for custom setups, high volume, or compliance controls

2. LangChain

Best for: Developers building custom AI agents from scratch, especially for research, RAG systems, or anything that needs tight control over agent behavior.

LangChain is the most widely adopted framework for building AI agents. It gives developers the core components to wire up tools, prompts, memory, and reasoning, with full control over how agents operate.

It was one of the first platforms to bring modular agent design to the market, and now functions like an operating system for LLM workflows.

You can chain steps, switch memory types, and plug into APIs or vector databases with ease with the ever growing support and code for the framework.

That depth however, comes with complexity. With so many moving parts, it can take time to find the right abstraction for your use case, and sticking with one can feel like building on a shifting foundation.

Key Features:

• Build agents using modular chains of tools, prompts, and memory
• Integrate with LLMs, APIs, vector stores, and retrievers
• Full developer control over flow logic and execution
• Optional tracing and evaluation with LangSmith

Pricing:

• Developer: Free – 1 seat, 5,000 traces/month, prompt management, basic tracing tools
• Plus: $39/month per seat – team features, higher trace limits, LangGraph dev deployment
• Enterprise: Custom – self-hosted or hybrid setup, SSO, support, and usage scaling

3. CrewAI

Best for: Teams prototyping multi-agent behavior quickly, especially for linear tasks that break cleanly across roles.

CrewAI is an open-source framework for multi-agent systems, enabling AI agents to collaborate on tasks through defined roles and shared goals. It is designed for scenarios requiring intelligent teamwork among agents.

What makes CrewAI appealing is how easy it is to get started. You define a crew, assign each agent a role, and give them a shared objective.

From there, the agents talk it out, run tasks, and complete goals without needing orchestration logic from scratch. For simple multi-agent use cases, it gets a surprising amount done with very little setup.

But that simplicity cuts both ways. Once your workflows get more complex — if agents need to adapt mid-task, or coordinate across conditional steps — the built-in abstractions can feel limiting.

Key Features:

• Role-based agent setup with assigned goals and memory
• Supports sequential and parallel agent execution
• Shared crew memory for team coordination
• Easy tool integration through functions and prompts

Pricing: 

• Free: $0/month – 50 executions, 1 live crew, 1 seat
• Basic: $99/month – 100 executions, 2 live crews, 5 seats
• Standard: $500/month – 1,000 executions, 2 live crews, unlimited seats, 2 onboarding hours
• Pro: $1,000/month – 2,000 executions, 5 live crews, unlimited seats, 4 onboarding hours

4. Microsoft Semantic Kernel

Best for: Enterprise teams embedding agent-like logic inside existing applications, especially those already using the Microsoft ecosystem.

Microsoft Semantic Kernel is an open-source AI orchestration framework that helps developers embed AI capabilities into existing applications.

Its focus on modularity, memory, and goal planning makes it well-suited for building robust AI agents that can operate within enterprise environments.

At its core, Semantic Kernel is about planning and execution. You define “skills” — which can be either native functions or LLM-backed prompts — and combine them into semantic plans that guide the agent’s behavior.

The framework handles memory management, supports tool use, and integrates cleanly with .NET and Python systems.

That said, it’s still a developer-first tool: there’s little visual scaffolding, and much of the orchestration requires deliberate design. 

Key Features:

• Modular skill-based architecture (functions, prompts, tools)
• Built-in memory and goal planning support
• Native integration with C#, .NET, and Python environments
• Open-source SDK with Azure integration options

5. AutoGen

Best for: Technical teams building collaborative, multi-agent workflows that need full visibility and traceability.

AutoGen is an open-source development framework for multi-agent systems based on structured conversation.

You assign each agent a role — Planner, Researcher, Executor, or a custom role — and let them exchange messages to tackle complex tasks together.

At its core, AutoGen manages message passing and shared memory. You script the conversation flow, inject logic where it matters, and decide when a human should step in.

It requires more setup than a low-code tool, but it rewards you with a fully transparent system that scales to research experiments, human-in-the-loop processes, or any scenario where you must track agent reasoning end to end.

Key Features:

• Structured message exchange with explicit role assignment
• Function-call injection at any point in the conversation
• Shared and scoped memory for each agent and across the crew
• Built-in audit logs that record every message and decision

6. AutoGPT

Best for: Solo developers and small teams prototyping autonomous workflows without constant supervision.

AutoGPT is an autonomous agent framework that turns GPT-chatbots into a self-planning, goal-driven assistant.

In practice, you hand it a goal, like “compile a market analysis,” and it breaks the job into subtasks, fetches data, writes files, or calls APIs on its own. It feels like handing off research to a junior analyst who needs very little guidance.

You’ll notice two things right away. First, AutoGPT’s autonomy empowers fully automated batch workflows that would stall if you tied them to a human agent.

Second, that same independence requires you to put thorough monitoring in place for each run to keep potential risks in check.

Over time, you learn to tweak its retry logic and plugin mix so it stays productive instead of wandering.

Key Features:

• Self-planning agents that decompose goals into executable steps
• Plugin system for web browsing, file operations, and custom APIs
• Vector-based memory that remembers previous facts and decisions
• Automatic retries and recovery when tasks encounter dead ends

7. RASA

Best for: Teams that need deep customization of conversational flows and full ownership of data and models.

Rasa is an open-source framework that blends natural language understanding with dialogue management to power context-aware chatbots and voice assistants. 

You assemble NLU pipelines from interchangeable components, then define dialogue policies that maintain context across multiple turns. This approach lets you swap in new intent classifiers or entity extractors as your domain evolves, without rewriting other parts of the system.

Because Rasa runs on your infrastructure, you keep complete control over data privacy and scaling.

Key Features:

• Advanced NLU pipelines that extract intents and entities
• Custom dialogue policies for complex, multi-turn conversations
• Extensible pipeline components to fit any domain or language
• Open-source codebase with integrations for messaging channels

Pricing: 

• Open Source: Free – includes full framework, Apache 2.0 license
• Pro Edition: Free – up to 1,000 conversations/month with Rasa Pro
• Growth: From $35,000/year – includes Rasa Studio, support, and commercial to

What is the difference between an AI agent and a chatbot?

A chatbot follows predefined rules to manage straightforward conversations. On the other hand, an AI agent operates autonomously. It can reason and make decisions across workflows, beyond just responding in a chat.

What is the learning curve for using these frameworks for non-technical users?

Platforms like Botpress or LangGraph offer visual builders and templates that lower the learning curve for non-technical users. However, setting up integrations or implementing custom logic still require some technical assistance.

What’s the difference between open-source and free commercial frameworks?

Open-source frameworks provide full access to the source code and can be self-hosted and customized extensively. Free commercial frameworks offer user-friendly interfaces and hosting, but may impose feature limits or require paid plans for advanced use.

How do I evaluate the performance of an AI agent built with these tools?

You can evaluate the performance of an AI agent using key metrics including task completion rate, response time, fallback or failure rate, and user satisfaction. Many frameworks include built-in analytics, or you can connect external tools for deeper performance tracking.

Which industries benefit the most from agentic automation?

Industries such as customer service, healthcare, finance, and e-commerce see major gains from automation, especially where repetitive tasks consume significant time.