mIRC - mIRC: Internet Relay Chat client
Padlet - Visual boards for organizing anything.
HexChat - HexChat is a fork of XChat with bug fixes and new features.
BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.
irssi - Irssi is a terminal based IRC client for UNIX systems.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.