Disk Inventory X is a disk usage utility for Mac OS X (10.3+). It shows the sizes of files and folders in a special graphical way called “treemaps”. If you’ve ever wondered were all your disk space has gone, Disk Inventory X will help you to answer this question.

OpenOffice.org 2 is the leading open-source office software suite  for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages  and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.

OnyX is a multifunction utility for Mac OS X (PowerPC and Intel). It allows you to verify the Startup Disk and the structure of its System files, to run misc tasks of system maintenance, to configure the hidden parameters of the Finder, Dock and of some of Apple’s own applications, to delete caches, to remove a certain number of files and folders that may become cumbersome and more.