A video editor with motion smoothing.

Install, configure, and use Open Broadcaster Software to record how-to, promotional, and other types of videos.

MPlayer has a fully configurable, command-driven control layer which allows you to control MPlayer using keyboard. But which are these shortcuts are not immediately know to users of MPlayer. Here is a list of mostly used MPlayer keyboard control shortcuts.

Watch videos together, play games, or simply chat with friends or strangers all from within your browser!

Skip YouTube video sponsors (browser extension).

asciinema lets you easily record terminal sessions and replay them in a terminal as well as in a web browser.

A cross-platform media player with many features such as frame timing, MKV chapters and subtitles. It is a responsive video player with minimal layout customizable with themes. A good alternative media player to VLC since it can handle almost all the media formats as VLC, but using much less resources.

One of the most popular video/audio players around; plays most audio and video formats (using ASCII characters) in the shell; provides a GUI for graphical visualization.

Lightweight graphical PDF visualizer; strong key-based control; fast and accurate rendering.

"X11 image viewer aimed mostly at console users" (cit.); with no fancy GUI, it is controlled via commandline arguments and configurable key/mouse actions.

A library and a program to display JPG, PNG, GIF or BMP images in the terminal using ASCII characters.

Quick ogg sound file player; no visual interface, just a command-line audio file player for the free and open ogg file format.

A curses player for music tracks from Youtube; it allows to search for songs and playlists; it downloads the video, extracts the audio track and plays it; handles local playlists and many configuration parameters.

Quick mp3 sound file player; no visual interface, just a command-line audio file player for mp3 files.

A powerful and easy to use console audio player; user interface a la Midnight Commander; plenty of features; fully controllable from the keyboard.

Image source: Wikipedia

A fast and lightweight audio player with configurable keybindings and playlist support.

ALSA mixer with curses interfaces.

eSpeak is a compact open source software speech synthesizer for English and other languages, for Linux and Windows. http://espeak.sourceforge.net

eSpeak uses a "formant synthesis" method. This allows many languages to be provided in a small size. The speech is clear, and can be used at high speeds, but is not as natural or smooth as larger synthesizers which are based on human speech recordings.