HKUDS's DeepTutor just passed 55k stars. For a study workspace. It tackles a familiar problem: a pile of textbooks and papers you can't get through, and a chatbot you don't trust to stay on the material. DeepTutor brings the whole learning process into one workspace. It combines Chat, Books, Reading, Practice, Task Board, Calendar, and a learning notebook. Create a workspace for each subject, upload your materials, and keep asking questions and practicing based on the same knowledge base. The biggest difference from regular AI chats: Your learning stays connected, with shared context and progress, instead of being scattered across disconnected conversations. It's open-source under Apache-2.0, with v1.7.1 released on November 1.