You can use the local search form here.
We also have an OpenSearch plugin at The Mycroft Project. You can install the OpenSearch plugin into several different web browsers to enable searching Leviathan directly in that browser's search bar.
You can also put a Leviathan Search form on your own web site with this HTML code.
For scripting or integration with your own app, you can get the search endpoint to return JSON-formatted results instead of a web page by including the header "Accept: application/json" in your request.
The index currently contains 18930 pages.