ORVL is a portable (C-language) control program for Orvibo (S20) devices.
ORVL runs on UNIX, UNIX-like (including macOS), VMS, and Windows systems, and has a command-line interface.
/ftp/orvl/orvl-0_2/orvl-0_2_src.zip
/ftp/orvl/orvl-0_2/orvl-0_2_win.zip
All versions of ORVL, including older and experimental ones, may be found at the archive: /ftp/orvl/
FTP access is also available at: ftp://ftp.antinode.info/orvl/