ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
Xapian - Xapian is an open source probabilistic information retrieval library, released under the GNU...
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online