Pages '09 will open AppleWorks v6 word processing documents, Numbers '09 will open AppleWorks v6 spreadsheets, and Keynote '09 will open AppleWork's presentations. ClarisWorks v5, and complex variations of these preceding document types will not open in Pages '09 applications. Pages '09 was the last Pages version to support opening these documents.
As Kappy mentioned, there is support in LibreOffice (v5.3.1.2 fresh as of this post) that opens some ClarisWorks v5, and AppleWorks v6 word processing, spreadsheet, and presentation documents. Databases will open as a spreadsheet with formating and formulas lost. Some drawing documents can be opened too.
Again, depending on how many ClarisWorks/AppleWorks features that you used in each document will have a direct bearing on your degree of success in opening them. LibreOffice is not an ClarisWorks/AppleWorks replacement application, and the intent is to save them into more transportable, modern document formats.
There is an AppleWorks Support Community available.