/usr/bin/rake Rake is a simple Ruby build program with capabilities similar to the regular make command.
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/rake Rake is a software task management and build automation tool created by Jim Weirich. It allows the user to specify tasks and describe dependencies as well as to group tasks in a namespace. It is similar in to SCons and Make. It's written in the Ruby programming language and the Rakefiles (equivalent of Makefiles in Make) use Ruby syntax.
The binary is a part of Ruby public framework.