Libre Office

LibreOffice features a word processor (Writer), a spreadsheet app (Calc), a presentation program (Impress), a database management tool (Base), a vector graphics editor (Draw), and an app for working with mathematical formulas (Math). LibreOffice also includes a PDF creation and import tool for working with Adobe files. 

Writer
Calc
Impress
Base
Draw
Math

Open Source Programs

While I was searching for Programs using the Open Source Software, I found this really good link: http://www.adciv.org/Examples_of_free_and_open-source_software

If you don't want to enter the link, I am going to give a brief list of the programs using the software.

Linux
Gimp
Open Office
Mozilla Foundation
Google Chrome
Audacity