Below is a list of software/services that are free (some may offer paid editions as well).

Software:

• CCleaner | http://www.ccleaner.com/ – free up space on your computer
• PureText | http://www.stevemiller.net/puretext/ – paste text without formatting
• Rainlendar | http://www.rainlendar.net/ – keep track of events and tasks (places a calendar on your desktop)
• Antimalware Programs:
  • Malwarebytes Antimalware, Spybot, SpywareBlaster
• Others:
  • 7-Zip, Firefox/Opera/Chrome, Notepad++, Skype, Teracopy, Windows Live Messenger

Services:

• Dropbox.com – free online backup service (2gb free)
• Gmail/Google Docs/Google Calendar
• RememberTheMilk – online to-do list management