Open-Source AI Chatbot Frameworks Reach Peak Maturity as Dify Surpasses 147,000 GitHub Stars

The landscape of open-source AI chatbot development has consolidated around a handful of mature platforms in 2026, with visual workflow builders and LLM-native architectures becoming the dominant paradigm. A curated list of ten GitHub repositories highlights the current state of the field, where frameworks span traditional NLU-based systems to contemporary agent-oriented platforms.