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So is Ollama
The easiest way to get up and running with large language models
★ 163.6K LLM AI License: MITOllama is a platform that makes it easy to get up and running with large language models. It provides a simple API to interact with the models, and you can use it to generate text, answer questions, and more.
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So is Open WebUI
A user-friendly interface for AI chat
★ 125.2K LLM AI RAG Chatbot License: MITAn extensible, feature-rich, and user-friendly self-hosted WebUI designed to operate entirely offline. It supports various LLM runners, including Ollama and OpenAI-compatible APIs.

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So is LobeChat
Open-source, modern-design AI chat framework
★ 72.7K LLM AI RAG Chatbot License: Apache-2.0 (with a twist)An open-source, modern-design ChatGPT/LLMs UI/Framework that supports speech-synthesis, multi-modal, and extensible (function call) plugin system.
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So is AnythingLLM
The all-in-one AI app you were looking for
★ 55.1K LLM AI RAG Chatbot License: MITTurn any document, resource, or piece of content into context that any LLM can use as references during chatting.
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So is LiteLLM
Proxy Server to call 100+ LLMs in the OpenAI format
★ 37.2K AI LLM License: MITCall all LLM APIs using the OpenAI format [Bedrock, Huggingface, VertexAI, TogetherAI, Azure, OpenAI, Groq etc.]
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So is Khoj
Your AI second brain
★ 32.6K LLM AI RAG Chatbot License: AGPL-3.0Khoj is a personal AI app to extend your capabilities. It smoothly scales up from an on-device personal AI to a cloud-scale enterprise AI.

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So is Onyx
Căutare enterprise open-source și asistent AI cu capacități avansate de recuperare
★ 17.6K AI Chat RAG Search LLM Enterprise License: MITOnyx (fostul Danswer) este o platformă open-source pentru căutare enterprise și asistent AI care se conectează la documentele, aplicațiile și persoanele companiei tale.

Sure, ChatGPT is awesome.
But have you considered these open source alternatives?
They are free, self-hostable and community-driven.
Check by yourself: Ollama , Open WebUI , LobeChat , AnythingLLM , LiteLLM , Khoj , Onyx .