SolrHQ can be used for search on a publicly facing web site, an internal intranet or custom content applications.
Even though the SolrHQ api is on a public facing web server, it is using secure api references that are extremely hard to forge.
We expect to provide an https access to the api in the near future.

Here are some examples of public sites using SolrHQ:

All the TnR Global web sites share a common SolrHQ search behind a Joomla CMS,
try the search function:

These are example  WordPress Sites using SolrHQ,