Depending on what size of Hard drive you have
Have a look at
Conqueronline Need a broadband link to download it(is a 2 GB file) plus a Download manager to retain the file for opening later
It took me close to 5 hours on my old 512 MB link to assemble the program(Have got a 1024 MB link now which halves the times)
Or if you're lazy? They will send out a CD for $10 / 6 pounds (UK) plus post and packing
The best download manager I have found (no spyware attached) ,easy to use is called Leechget from
www.leechget.net/en/ Daft name ,reliable performer

The home page for Conqueronline has many screen shots of the game wnich is played like Diablo and has lots of elements of Runescape too
and most important of all its Free
www.conqueronline.comAlso have a look though this list
www.gamershell.com/client_download_archive.html Clicking the link
once only will take you to a detailed description of the game
some here are time limited demos others turn into a "pay game" after a free trial period

And there are some fully free games on the list
Those with the
MMOG label are the Runscape type games
And I think a download manager program will be needed with most of these programs.