You can check the following locations for apps that automatically launch on startup and delete any you don't need/want:
- System Preferences > Users & Groups > yourusername > Login Items (SL and older: System Preferences > Accounts > yourusername > Login Items)
- In Finder, click Go > Go to Folder > /Library/LaunchAgents
- In Finder, click Go > Go to Folder > ~/Library/LaunchAgents
- In Finder, click Go > Go to Folder > /Library/StartupItems
After you delete items from the list, restart your Mac and those processes should not be running.