layouts/partials/navbar-ecosystem-selector.html

<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown"
  aria-haspopup="true" aria-expanded="false">
  {{ .Site.Params.Ecosystem.navLabel }}
</a>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdownMenuLink">
  {{ range .Site.Params.Ecosystem.navOptions.items }}
  <a class="dropdown-item" href="{{ .url }}">{{ .name }}</a>
  {{ end }}
</div>