EtherPad is a collaborative, web-based text editor that supports concurrent document changes, versioning, and built-in formatting for a group of people. Etherpad makes it easy for people to simultaneously type, in real-time, on one document. Each author enters their name and selects a color - as they type, text shows up as a color. A collaborative "pad" can be created by anyone, and each pad has its own URL. It is possible to set up password protected pads.
PowerPoint is commercial presentation software that is part of the Microsoft Office suite. PowerPoint presentations consist of a number of individual pages or "slides". Slides may contain text, graphics, sound, animation, movies, and other objects. The presentation can be printed (with or without speaker notes), displayed or projected live by computer, or exported as an animated movie. Slides can also form the basis of webcasts.
Skype is VOIP and instant messaging software that allows voice and chat communication between computers and phone systems via the internet. Direct computer to computer via the internet is free of charge, and computer to phone connections via the internet have a relatively small fee. Additional features include video conferencing and file transfer. Acquired by Microsoft in May 2011.