BusyBox

BusyBox is nicknamed "The Swiss Army Knife of Embedded Linux " and consists of compact versions of GNU Linux utilities. It has become almost a standard for embedded Linux systems and for Linux distribution installers.

It is built as a single executable which is called using different names to access each utility. The utilities have limited options which provide sufficient functionality for embedded applications. BusyBox is extremely modular and can be built by adding utilities to a "bare-bones" Linux core. It is licensed under the GNU General Public License Version 2.