GNU Readline is described as 'GNU readline is a software library that provides line-editing and history capabilities for interactive programs with a command-line interface. It allows users to move the text cursor, search the command history, control a kill ring (a more flexible version of a copy/paste' and is a terminal emulator in the os & utilities category. There are four alternatives to GNU Readline for Linux, BSD, Mac and Windows. The best GNU Readline alternative is Python Prompt Toolkit, which is both free and Open Source. Other great apps like GNU Readline are libedit, replxx and Linenoise.