LibreOffice - LibreOffice was officially developed for Microsoft Windows (IA-32), Linux (IA-32 and x86-64), and OS X (IA-32 and x86-64). The LibreOffice suite has programs for word processing, creating and editing spreadsheets, slideshows, diagrams and drawings, working with databases, and more.
Foxit Reader – A PDF Reader also lets you fill PDF forms on your PC
Chrome or FireFox – Free Web browsers that can improves your productivity and allows you to use your computer the way you like.