TextEdit will open them, but often doesn't display them correctly.
I really like QuickLook, but it won't stay open and doesn't allow for copying text.
OpenOffice seems to read the files adequately, but is slow to launch.
The ideal would be something like Preview that can open Word docs.
Best Answer
Try Bean.
The last time I tried it, it was pretty quick (quicker than OpenOffice) and according to the website, can open
.docxfiles.