iTerm2 is a free and open-source terminal emulator for macOS, licensed under GPL-2.0-or-later. It was derived from and has mostly supplanted the earlier "iTerm" application.
iTerm2 supports operating system features such as window transparency, full-screen mode, split panes, Exposé Tabs, Growl notifications, and standard keyboard shortcuts. Other features include customizable profiles, Instant Replay of past terminal input/output, a Toolbelt showing running jobs and a command history, the ability to open when a key combination is pressed, and autocomplete.