One great thing with Eclipse compared to proprietary IDEs are the thousands of available plugins. Yes, not every plugin is probably on the ‘must have’ list (I have listed some in a series starting with “5 Best Eclipse Plugins: #1 (Eclox with Doxygen, Graphviz and Mscgen)“).
The ‘traditional’ approach to install Eclipse plugins is using the menu Help > Install New Software. Using that approach, I have to use or enter an Eclipse update site. An easier way is to use the Eclipse Marketplace plugin which allows me to search and browse for plugins and simplifies installation of it. But as this one does not come installed by default with MCUXpresso. But it is my preferred way to browse and install plugins into Eclipse: