selector is a command line utility for dynamic string selection. As you type a list of substrings separated by ";" or a regexp, the display is updated in real time to show only the matching lines. The main usage of selector is as an efficient search in the shell command history. With the correct option, it will inject the selected line into the terminal input buffer, allowing the user to edit the line and execute it as a standard command.
hsh is a command-line driven user interface to your system with a full-screen curses interface instead of the scrolling terminal style output of traditional shells. The main purpose of hsh compared to a traditional shell is to make job output easier to work with. Each job's output is viewed and manipulated independently. This means, among other things, that you can incrementally create pipelines, and that a rampant process can't trash all the output of your session. Its syntax is designed for human use, not a programming language. It has a dynamic configurable interface, making useful information accessible.