Google Presentation, as with Google Docs and Spreadsheets can be run directly from your web-browser without having to download any additional software. Google Presentations is perfect for creating basic presentations for work, school, or just play. Allows you to save your presentations to your Gmail account and share them easily with others.
KPresenter is a fully-featured presentation program for primarily KDE. Presentations can be edited directly within KPresenter, and many advanced features for screen presentations are available.
More power to your Presentation! Impress is a truly outstanding tool for creating effective multimedia presentations. Your presentations will stand out with 2D and 3D clip art, special effects, animation, and high-impact drawing tools.