Welcome to TS!
Do you have Appleworks? In particular Appleworks 4 and 5 came with a lot of DataViz translators. Or you can get the official paid version of MacLinkPlus
HERE.If you have just a few files it may not pay to buy the software. You may be able to find someone who can just open them and convert to a newer form for you.
You didn't say what machine or OS you are using. That is always a help so we can get an idea of the software you might have available natively on your computer.
You can also download a free version of WordPerfect
HERE Be sure to also download the updater for OS 8/9 if you want to use it. Also converters and tips are available from
this page.
Others will probably be by with different suggestions.