"A disk usage analyzer with an ncurses interface. It is designed to find space hogs on a remote server where you do not have an entire graphical setup available, but it is a useful tool even on regular desktop systems. 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."

See Star Wars in ASCII with telnet towel.blinkenlights.nl.

A steam locomotive traverses the screen from right to left if sl is typed instead of ls.

Generates random messages fetched from a quotation database.

A program that generates a ASCII art of a cow with a bubble containing the specified message. I provide the Wikipedia link since at the moment the link to the author's homepage results to be unreachable).

ncurses program that displays the scrolling lines found in the movie The matrix.

Enjoy the mysteries of the sea from the safety of your own terminal!

Type words that are flying by from left to right as fast as you can; features different word sets, e.g., UNIX commands, English words, Non-English words.

Single player rogue-like dungeon exploration game; I am currently addicted to Pixel Dungeon and its derivatives (Android apps), thus I find nethack a little bit too graphically poor.

A Minesweeper clone for the terminal which allows you to configure settings such as table rows and columns up to 1024x1024!), percentage of bombs, colors and also has a highscores table.

A fantasy game using ASCII art graphical representation of the game environment; it features a rich environment with many options and possibilities.

bastet implements the classical Tetris but with a logic to generate the next block which maximizes the difficulty for the player.

Curses front-end for Remind written in OCaml with vertically scrollable time table.

A comand line interface to manage hierarchical todos. Each task has a title, a long text description, a deadline (tudu warns you when the date is close), and a scheduled date. There are categories and priorities.

A minimal clone of Wunderlist, with 30% of its features. GTD oriented. It stores the task list in a hidden JSON file in the home directory, making it easy to backup or share them.

Minimalistic todo manager that uses a simple plain text file to keep track of items; implemented as a shell script.

Todo manager with advanced features; dedicated synchronization server available; many plugins and related tools; healthy software project.

Calendar program for Unix/Linux systems that can keep track of events; custom, plain text storage format; interesting and fully functional.

Project-based todo manager: every task must be specified with a mandatory project indication. Tasks are stored within a SQLlite DB. Written in Python.

A fully-featured task manager encapsulated within a Python script (just carry around the script to retain all the TODOs). When the script is run, a Python shell is opened, where task-related commands can be entered (ADD, LIST, etc.); a pity that commands are uppercase, which requires the annoying use of the Shift key.