Tribus is described as 'Enterprise search, simplified. Cloud-based enterprise search solution that search across all of your organization’s content sources — Aconex, Procore, Dropbox, Microsoft Sharepoint, Onedrive, and more' and is an app in the Online Services category. There are more than 50 alternatives to Tribus for a variety of platforms, including Online / Web-based, Linux, Self-Hosted solutions, Mac and Windows. The best alternative is elasticsearch, which is free. Other great apps like Tribus are MeiliSearch (Free, Open Source), Algolia (Free Personal), Apache Solr (Free, Open Source) and Sphinx (search engine) (Free).
Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and JSON APIs. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, and rich document handling.
Sphinx is a software search engine designed with indexing database content in mind. It currently supports MySQL, PostgreSQL, and ODBC-compliant databases as data sources natively. Other data sources can be indexed via pipe in a custom XML format.