Free to-do lists

With "Remember the Milk"
Never forget your to-do list at home again, your list will follow you.
Receive reminders via email, instant messenger, and SMS.

Free 128bit file encryption

Cryptainer LE

• Creates an encrypted container (vault) to store any type of data.

Simple to use encryption and it is free.

Free Finance Managment Software

GnuCash is a way to manage your personal or business finances using Free Software.
Yes, GnuCash now runs on Mac OSX, as well as GNU/Linux, *BSD, and the traditional Unixes: Solaris, AIX, and so on.

Free treemaps utility

I Just found out about some free disk usage utilities for Mac and Windows, that allows you to see a graphical view of the contents of your hard drive.

For Mac : Disk Inventory X

For Windows: TreePie and SequoiaView