You need look to no farther than the right sidebar on any page on this site to find the links to the 3 sites that you can try installing and playing around with. Click the image in this article to see a full size image of where these apparently hard to find links are.
As usual, the username/database name/password is the sub-domain name. Example, totallyfree.yourfreewordpress.com would have a username, etc, of “totallyfree”. Simple enough?
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Or check out my other blog: THE Tablet Test Server