How to convert XLS file to DBF format

There are two ways to convert Excel (xls, xlsx) files to dBase, FoxPro (dbf) format. Both tools can work in two modes:
- a wizard, using graphic interface
- using a command line

In the first case you select one or more source files, the output file or folder, and there are several options to customise the output files.
i.e. you can select a type of file: dBase III, dBase IV, FoxPro etc.

In the second case you use command line interface:
it allows you to run the program with predefined parameters manually or using scheduler to automatise routine work.

For example (Windows and OSX):

xls2dbf.exe c:\source\file.xls -output=d:\target\ -batch -type=foxpro /users/owner/file.xls -output=./target/ -batch -type=dbase