1. Application Software
1.1. Web browser
1.1.1. Google Chrome
1.1.2. Internet Explorer
1.2. Word processing
1.2.1. Microsoft Office Word
1.2.2. OpenOffice.org Writer
1.3. Spreadsheet
1.3.1. Microsoft Office Excel
1.3.2. KCells
1.4. Database
1.4.1. Microsoft Office Access
1.4.2. OpenOffice.org Base
1.5. Presentation
1.5.1. Microsoft Office PowerPoint
1.5.2. OpenOffice.org Impress
2. Categories
2.1. Open Source
2.1.1. Free
2.2. Proprietary
2.2.1. License/paid
3. System Software
3.1. Operating System
3.1.1. A set of programs containing instructions that work together to coordinate all the activites amoung computer hardware resources.
3.1.1.1. Stand alone OS
3.1.1.2. Server OS
3.1.1.3. Mobile OS
3.2. Functions OS
3.2.1. Start and shutdown computer
3.2.2. Provide user interface
3.2.3. Manage program
3.2.4. Manage memory
3.2.5. Establish internet connection
3.2.6. Monitor performance
3.2.7. Control a network
3.3. Utility program
3.3.1. A type of system software that allows user to perform maintenance-type task.
3.3.1.1. Spyware remover
3.3.1.2. Anti-virus program
3.3.1.3. File manager
3.3.1.4. Disk cleanup
3.3.1.5. Compression tools
3.3.1.6. Disk defragmenter
3.3.1.7. Backup and restore