(MS Office) Microsoft Office PowerPoint 2000, 2003 or 2007 is a great office editing tool to create powerful Presentation slides in .ppt or .pps file format so that your presentation will stand out with animations, 2D or 3D clip arts, and special moving effects. Besides Microsoft Office Power Point Presentation software, there are many alternatives to this, so you will not need to pay anything to use a legal Microsoft Office PowerPoint.
There are two types, either offline or online web-based version. For offline version, you can install and run it free on your PC. For web based version, you can use directly without need to download the installer file.
It is so convenient, you can create, edit, save and download the file to your PC at anywhere in the world as long as you have Internet connection.
Open Office Impress
Open Office “Impress” is a free office suite similar to Microsoft PowerPoint application, an offline tool that can be used to create Presentation file.
Google Docs is a web-based Microsoft PowerPoint that you can use with your Google account, a free application to view and edit your .ppt or .pps presentation files online.
280 Slides is also web-based free Microsoft PowerPoint software presentation editor allows you create your presentation easily online, download, and share with your friends, it is just similar to Google Docs.