BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides replacements for most of the utilities you usually find in GNU fileutils, shellutils, etc. The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts. BusyBox provides a fairly complete environment for any small or embedded system.
A Mac PreferencePane for managing services with launchd/launchctl. LaunchRocket was primarily created for managing various services installed by Homebrew, though it should work with most launchd-compatible plists.
FFcast helps the user interactively select a screen region and hands over the geometry to an external command, such as FFmpeg, to record a screencast, or take a screenshot, among other things.
FFcast really is a “handy” or “human friendly” interface for anything involving selecting a box on the screen. In the same spirit, it tries to provide handy terse commands for common tasks, and allows users to define their own commands, in a straight-forward manner, to tailor to their own needs.