Here are a few of my suggestions for software.
Type of Software Paid Software Free Software
Antivirus Trend Micro Internet Security Avast
Malware Malwarebytes Malwarebytes
Office Suites Microsoft Office Open Office
Photo Editing Photoshop Gimp
Drafting Software Autocad Draftsight
Just be carefull of where you download the free ones. Many of these site's have Malware or virus's attached. One of the better site's to download from is Just make sure you download from one of their mirror site's.