Notihub turns Messenger, Zalo, Gmail, Slack, Telegram, WhatsApp and any web app into one native macOS hub. Press your hotkey and a menu bar panel drops over whatever you're doing — read and reply without switching apps, tabs or Spaces. Every alert lands in real macOS Notification Center with per-service icons, and clicking one jumps to that exact thread. Plus multi-account sessions, regex notification filters, quiet hours, and idle-tab auto-sleep. Free, open source, no telemetry.