Current stable release: Build 125, 2019-05-08 (Release History)
The generic package contains the jar file, the manual (HTML and PDF), shell scripts for Linux/Unix based systems (including MacOS) to start the application as well as a Windows® launcher and sample XSLT scripts.
The download includes the language files for English and German. The application's language can be changed from within the options dialog (Tools -> Options).
If you want to import or export Microsoft Excel files (XLS, XLSX) or import OpenOffice Calc documents, download the "Generic package including all optional libraries" (approx. 30MB). If you are in doubt which one to use, download that.