This free tool lets you build your own ChatGPT app. No code. No cost. It’s called Dify and it has over 130 thousand stars on GitHub making it one of the top 100 open source projects in the world. You get a drag and drop canvas where you wire together AI workflows visually. Upload your own documents and it builds a RAG pipeline automatically so your app can answer questions from your files. It supports every major model — Claude, GPT, Gemini, Mistral, Llama, and over 100 more. Switch between them in one click. You can build a customer support bot, a document Q&A tool, an AI writing assistant, a research agent anything and publish it as a web app or API without writing a single line of code. Self-host it with Docker for free and you pay nothing except your API costs. Comment “GPT” below and I’ll send you the link. #aitools #nocode #opensource #llmtools #chatgpt