otak - Personal Information Manager is one of the easiest-to-use, and free, Personal Information Manager (PIM).

otak is the complete (for me) Personal Information Manager. Yes, it's freeware. And yes, it's another one of those software with irritating lower-case names.

otak combines calendar-based journaling with tree-nodes based notes called Thoughts. It also provides an Address Book, a multi-list task manager (called Task Master), an Internet Bookmarks Manager to consolidate all your bookmarks, and a Password Manager to store all those pesky passwords we are all forced to remember.