CodeTwo Autologon is a FREE Windows utility that automatically fills in user's credentials every time they access a given SharePoint site or Exchange mailbox. Supports multiple accounts, and works from outside domain profiles. I tested it with links to files in Office365 SharePoint Online and it worked fine. Requires Internet Explorer and/or Microsoft Outlook.
Paragon Software Group have a Free version of their hard drive management tools called Rescue Kit 14 Free Edition. Rescue Kit is a complete collection of powerful rescue wizards that will help you to rescue your system and your data. For personal use only, see http://www.paragon-software.com/home/rk-free/download.html