File Jucier can extract images and text from PageMaker files. This may be useful if you can no longer run PageMaker as it no longer works on the newest version of Mac OS. The extraction is not WYSIWYG, but it searches the raw PageMaker file for images and text and extracts this in individual files.
The extracted text is not formatted but raw, and it will likely contain some leftovers. More about Text Extraction.
Adobe encourages PageMaker users to upgrade to InDesign which can import PageMaker files. This may be a good option if you wish to preserve the formatting of your PageMaker files.