psSiteSearch is a search engine module for your DNN website, Office and PDF documents. It is a direct replacement for the built-in search engine and gives real results. It is based on Lucene.net and includes a web spider which is used to crawl and index your site.
Evotiva DNN User Files is an easy to use and powerful files and documents manager. Modern and flexible UI. Index contents of documents. Secure your files in your favorite cloud storage provider. Unique 'dynamic root' feature, and more.
Search Boost is a highly tuned search solution that radically re-imagines the standard DNN search. It is the best alternative if you want more control over what gets searched, who gets to search, and what results you see.