That's because once a Maven project is created in Eclipse, the m2eclipse plugin enables a variety of tools, context menus and features that make it easy for developers to compile, test, package and ...

Choose "Mac OS X (Cocoa)”. For beginners, select the 2nd (or 3rd) entry "Eclipse IDE for Java Developers”. You will then receive a DMG file (e.g., "eclipse-java-oxygen-2-macosx-cocoa x86_64.dmg").