ReportWorkshop generates reports as rich text documents, so they can be exported to HTML, DocX, RTF.
(but value visualizers, like bars displayed on background of table cells, are not exported to DocX and RTF).
Unlike other Delphi reporting tools, these exported files can be easily edited, because content is arranged in normal text flow, not positioned at coordinates.
Theoretically, reports can be exported to PDF too, but our components do not include PDF export methods. Any PDF library that can perform "canvas drawing to PDF" conversion can be used. For Delphi, it is possible to use several PDF libraries (LLPDFLib, SynPDF, eDocEngine). Unfortunately, I do not know PDF generation library for Lazarus.
But reports can be printed, so PDF printer can be used.