1. htop Ncurses Based top Replacement
An interactive process viewer for Linux. It is a text-mode application (for console or X terminals) and requires ncurses.
htop screenshot
2. NCurses Disk Usage
A disk usage analyzer with an ncurses interface, aimed to be run on a remote server where you don’t have an entire gaphical setup, but have to do with a simple SSH connection. ncdu aims to be fast, simple and easy to use, and should be able to run in any minimal POSIX-like environment with ncurses installed.
Ncdu Screenshot
3. tig a git Repository Browser
Tig is a git repository browser that additionally can act as a pager for output from various git commands.
tig screenshot
4. tmux Terminal Multiplexer
tmux is a terminal multiplexer: it enables a number of terminals (or windows), each running a separate program, to be created, accessed, and controlled from a single screen. tmux may be detached from a screen and continue running in the background, then later reattached.
tmux screenshot