Open Source AI Development Platforms using Prettier

A curated collection of the best free and open source platforms for building AI applications, covering agent frameworks, retrieval pipelines, prompt orchestration and model gateways using Prettier.

Hermes Agent

A self-improving agent from Nous Research that learns skills, keeps memory across sessions and reaches you on any chat platform.

Alternative to:

ChatGPT

Desktop AI agent with persistent memory across platforms

Stars
257,810
Forks
56,545
Last commit
17 hours ago

LobeChat

Open source workspace for hiring, scheduling and supervising a team of AI agents that keeps working while you are away.

Alternative to:

ChatGPT

Manage, build, and run AI agent teams around the clock

Stars
83,541

Mem0

A memory layer that lets AI assistants and agents remember user preferences and past sessions instead of restarting context every conversation.

Alternative to:

Supermemory

Persistent memory layer for AI agents and apps

Stars
67,951

LibreChat

A self-hosted chat interface that puts every model provider, agent, tool and file workflow behind one familiar conversation UI.

Alternative to:

ChatGPT

One interface for all your AI models and conversations

Stars
46,400

CopilotKit

SDK for developers building agent-native apps, adding chat, generative UI, shared state and human-in-the-loop across web, mobile and chat platforms.

Alternative to:

Voiceflow

Build AI copilots for your product in hours, not months

Stars
38,294

OpenWork

A desktop app and MCP server for sharing AI skills, plugins and connected services across your agents, teammates and machines.

Alternative to:

OpenAI Codex

Multi-model AI workspace with org-wide skill sharing

Stars
24,295

Suna

Open source AI management system where agents, skills, memory and connectors live in a git repository your company owns.

Alternative to:

ChatGPT

AI agent that autonomously handles real-world tasks

Stars
20,323

Parlant

Interaction control harness for customer-facing AI agents, giving teams precise behavioral control in regulated and high-stakes conversations.

Alternative to:

Google Dialogflow

Structured control layer for customer-facing AI agents

Stars
18,312

E2B

Cloud sandboxes for running AI-generated code safely, aimed at developers building agents that need to execute what a model writes.

Alternative to:

Modal

Secure cloud environments for enterprise AI agents

Stars
14,584

Botpress

Chatbot and assistant platform with a CLI, SDK and integration hub, for developers shipping conversational products on Botpress Cloud.

Alternative to:

Voiceflow

Build powerful AI agents with cutting-edge LLM technology

Stars
14,972

Portkey AI Gateway

An API gateway that routes requests to hundreds of model providers, with retries, fallbacks, caching and guardrails in front.

Alternative to:

Cloudflare AI Gateway

Complete production stack for AI teams

Stars
13,284

Nango

An integration platform that handles auth, execution and observability for 900 plus APIs, for teams shipping product integrations.

Alternative to:

Composio

Build product integrations with 500+ APIs in hours

Stars
13,014

Rivet

A library for stateful backends where each agent, session, document or tenant runs as a long-lived actor with in-memory state.

Alternative to:

Azure Durable Functions

Build stateful backends with in-memory actors

Stars
6,379

ACI.dev

A tool-calling platform that connects AI agents to hundreds of services with managed authentication, permissions and dynamic tool discovery.

Alternative to:

Composio

Build reliable AI agents with unified tool integration

Stars
4,924

LLM Gateway

An API gateway that routes requests to multiple LLM providers through one OpenAI-compatible endpoint while tracking tokens, costs, and response times.

Alternative to:

Cloudflare AI Gateway

Unified API for all LLM providers with analytics

Stars
1,714

Hexabot

Self-hosted platform for building agentic workflows in YAML and running them across conversational channels with tools, memory and RAG.

Alternative to:

Voiceflow

Self-hosted AI agents and workflows across any channel

Stars
1,148

ByteChef

A workflow automation platform where AI agents run as ordinary steps and 250 plus connectors double as agent tools and MCP tools.

Alternative to:

Zapier

Build AI agents and automate complex workflows seamlessly

Stars
1,050

AgentOS

TypeScript framework for AI agents with persistent memory, tools forged at runtime and one dispatch interface across eleven model providers.

TypeScript framework for building autonomous AI agents

Stars
683
Forks
101

Giselle

Visual builder for AI agent workflows that chains several models and plugs into GitHub, for teams automating product delivery work.

Alternative to:

Lindy

Build and deploy AI agents through visual workflows

Stars
557

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Open Source AI Development Platforms using Prettier

A curated collection of the best free and open source platforms for building AI applications, covering agent frameworks, retrieval pipelines, prompt orchestration and model gateways using Prettier.

Hermes Agent

LobeChat

Mem0

LibreChat

CopilotKit

OpenWork

Suna

Parlant

E2B

Botpress

Portkey AI Gateway

Nango

Rivet

ACI.dev

LLM Gateway

Hexabot

ByteChef

AgentOS

Giselle

Hermes Agent

LobeChat

Mem0

LibreChat

CopilotKit

OpenWork

Suna

Parlant

E2B

Botpress

Portkey AI Gateway

Nango

Rivet

ACI.dev

LLM Gateway

Hexabot

ByteChef

AgentOS

Giselle

LiteLLM