Sublime Text 3 is a versatile text editor available for multiple platforms. Macaulay2 is open source software for computing with algebraic varieties. These files provide syntax definitions and syntax highlighting for Macaulay2 files (.m2) when working in Sublime Text.
To use these files with a working version of ST3 place m2syntax.sublime-syntax into the Sublime Text 3/Packages/User folder and macaulay2.tmTheme into the Sublime\ Text\ 3/Packages/User/Color\ Schemes folder. Open a file with the file extension .m2 (or create one if necessary) and change the color scheme to macaulay2.