lightweight, free and open-source, ncurses, command-line chat client for IRC, etc.

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Busy IRC chat rooms are high-volume streams of text data. A good chat client will be able to simultaneously handle open windows for multiple rooms without getting bogged down. The free and open-source WeeChat client is adept at handling such loads. It's lightweight enough to run on a Raspberry Pi and stable enough to run for days in a GNU Screen session. Well-documented and well-maintained, WeeChat is an excellent piece of software!