About gnu-cobol : Implements much of the COBOL 85 and COBOL 2002 standards!
More Information: http://www.opencobol.org/
Steps:

1. Launch Terminal by pressing command+space, type terminal and hit Enter key.
2. Run

   ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

3. Install

   brew install gnu-cobol

Done!

More about gnu-cobol:

GnuCOBOL (formerly OpenCOBOL) is a free COBOL compiler. cobc translates COBOL source to executable using intermediate C, designated C compiler and linker.

OpenCOBOL 1.1 became GNU Cobol 1.1 in 2013.
GnuCOBOL 2.2 is the latest, version 3.0 is on its way.

A programmer’s guide, by Gary Cutler and Vincent Coen, is indexed at https://open-cobol.sourceforge.io together with more documentation.

OpenCOBOL was written by Keisuke Nishida and Roger While, from 2001 to 2012.
GnuCOBOL is also authored by Simon Sobisch, Ron Norman, Edward Hart, Sergey Kashyrin, Dave Pitts and Brian Tiffin. Others listed in the AUTHORS and THANKS files.