Mozilla Firefox (Free)
Fast secure and stable internet browser, arguably better than Microsoft's internet explorer.

Hamachi VPN (Basic free)
Zero configuration VPN software, interconnect your networks with very little required knowledge, giving you the ability to remote desktop your work comuter from home and access shared files and emails.

PDF Forge (Open source and free)
Print documents to .pdf format for neat presentation as well as the ability to do simple editing directly to .pdf files.

Open office (Open source and free)
Free alternative to Microsoft's office suite, opens the MS office file formats.

Office 2007 compatibility package for office 2003 (Microsoft patch)
Had problems opening 2007 documents in 2003, Colour pallet issues in 2003 or other compatibility problems? This could be the ideal cure!