It is not that Microsoft is one and only developer of power point applications.Many other companies also produce such type of applications. 1. Impress Second most popular presentation tool next to MS PowerPoint.Comes with the Openoffice suite of productivity softwares.Completely free.You will find nearly all the features of MS PowerPoint in Impress .You will also find a diagram-drawer,slide manager etc.The main problem of Impress is that you can not convert a Impress presentation into MS Powerpoint one.You need Impress in your computer to open a presentation made in Impress. 2. ThinkFree Show ThinkFree Desktop(also has a Online and Portable version) is the compatible alternative to Microsoft® Office. It includes ThinkFree Write (word processing), ThinkFree Calc (spreadsheet), and ThinkFree Show (presentation) applications that let you create, edit, and update your documents.Its online version is similar to Google Docs .The ThinkFree Presentation viewer is an awesome tool to share your...