Although Appleworks included an earlier version of MacLink, it is still possible to buy the stand alone program MacLinkPlus Deluxe® from Dataviz. The most recent version is 15, the program is upgraded frequently as new file formats are introduced. First time cost is ~$80; the upgrades do cost ~$40, but it is only necessary to upgrade if you run into a file you can't convert. I've been able to skip several versions (I think I went from 10 to 13) and there is no penalty for doing so. This might prove a better solution than switching to other database and spreadsheet programs, especially if Appleworks still meets most your needs.