I think of the download button as optional. What I like about the site is the visualization. So, for instance, you know that Express is an alternative to Mete

I think of the download button as optional. What I like about the site is the visualization. So, for instance, you know that Express is an alternative to Meteor, not a complement. And that Jade/Handlebars work with Express and are alternatives to each other. Just having that for all the combination of names is valuable. Basically, it helps you understand the taxonomy.