iTerm2
iTerm2 is a terminal emulator for Mac OS X that does amazing things
...It extends and improves on the built-in Terminal app by offering advanced features like split panes, profiles, search, autocomplete, instant replay of terminal history, and much more. The repository contains the full source code (primarily in Objective-C / Swift) along with UI components, extensions, and support tools. It is released under the GPL-2.0 license. The project is quite mature (with many commits and contributors) and supports scripting and automation via an API (including a Python library in the api/library/python/iterm2 path). To build it, you can compile the Xcode project included, and there is documentation and instructions linked from the project’s README (note: issue tracking is handled via GitLab, as the repository refers issues there). ...