Group chats bury class files; "Does anyone have the notes?" gets asked every semester, buried in scrollback by exam week. SlipNote: one link per class, no accounts ever. Zero setup, drop the link, and anyone can add or grab files right away. Download a whole section as a zip before exams, preview PDFs in-browser, or scan a QR code off a slide. Free, open source, and self-hostable if you want full control.