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Open Source AI Chat Interfaces using Testing Library

A curated collection of the best open source user interfaces for chatting with various AI models. using Testing Library.

Parlant

AI
Structured control layer for customer-facing AI agents

  • Stars

    18,313

  • Last commit

    3 days ago

  • License

    Apache-2.0
A conversational AI server that manages agent behavior through context-aware guidelines, keeping responses consistent, auditable, and aligned at scale.

Open Source Alternative to:

Voiceflow

Proton Lumo

AI
Private AI chat with zero-access encryption

  • Stars

    5,668

  • Last commit

    10 hours ago

  • License

    GPL-3.0
AI chat assistant from Proton that stores conversations with zero-access encryption, never logs chats, and never uses your data to train models.

Open Source Alternative to:

Claude

LobeChat

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

  • Stars

    83,612

  • Last commit

    7 hours ago

  • License

    Unknown
A collaborative platform to create, schedule, and operate AI agents that handle long-running tasks, team workflows, and automated jobs without constant oversight.

Open Source Alternative to:

Claude

Cherry Studio

AI
Multi-model AI desktop client with local-first privacy

  • Stars

    53,106

  • Last commit

    7 hours ago

  • License

    AGPL-3.0
Desktop AI client for Windows, macOS, and Linux that connects 300+ models from 50+ providers, with local storage, a built-in knowledge base, and autonomous agent mode.

Open Source Alternative to:

Claude

LibreChat

AI
One interface for all your AI models and conversations

  • Stars

    46,503

  • Last commit

    7 hours ago

  • License

    MIT
Chat with multiple AI providers through a single self-hostable interface, with support for custom agents, file uploads, plugins, and multi-user access control.

Open Source Alternative to:

Claude

CopilotKit

AI
Build AI copilots for your product in hours, not months

  • Stars

    38,397

  • Last commit

    8 hours ago

  • License

    MIT
Integrate production-ready AI copilots into any product quickly and easily with CopilotKit's open-source platform.

Open Source Alternative to:

LangChain

5ire

AI
Smart desktop AI assistant with powerful local knowledge features

  • Stars

    5,375

  • Last commit

    19 hours ago

  • License

    Unknown
Cross-platform desktop AI assistant supporting multiple providers, local knowledge base, and custom prompts. Integrates MCP protocol for enhanced AI tool capabilities.

Open Source Alternative to:

Claude
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