Tabby (formerly Terminus) is a cross-platform terminal emulator built with Electron and Angular 15. It serves as a modern replacement for terminal applications like Windows conhost, PowerShell ISE, PuTTY, macOS Terminal, and iTerm. The application provides integrated SSH, Telnet, and serial clients, local shell support (cmd, PowerShell, WSL, bash, etc.), split panes with drag-and-drop, a fully customizable hotkey system, themes, and an encrypted vault for credentials. The architecture is a monorepo of Angular modules (tabby-core, tabby-terminal, tabby-ssh, etc.) that communicate through dependency injection providers. A plugin system allows third-party packages to extend functionality via well-defined abstract classes (HotkeyProvider, ProfileProvider, TerminalDecorator, etc.). The web variant (tabby-web) provides a browser-based SSH/Telnet client but lags behind the desktop version. The codebase is mature with extensive i18n support, CI/CD pipelines, and community contributions, but shows some drift with Angular 15 being several versions behind current and some legacy naming (terminus- prefix).