Xendo is an online research tool that provides unified search across cloud-based storage (such as Dropbox, Evernote, Google Drive, OneDrive) and email (such as Gmail, Office 365) and other services such as Slack, Trello and Asana (25 integrations to-date). Xendo offers advanced search capabilities such as proximity searching (looking for term or phrase within a number of words of a second term or phrase). Xendo uses OCR (Optical Character Recognition) to make scanned documents searchable. For some services, Xendo offers a content preview to speed research.

A text-mining system for scientific literature. Textpresso's two major elements are (1) access to full text, so that entire articles can be searched, and (2) introduction of categories of biological concepts and classes that relate to objects (e.g., association, regulation, etc.) or describe one (e.g., methods, etc).

Lextek offers a range of services and software for full-text indexing search and retrieval; automatic classification, routing, and filtering electronic text according to user defined profiles. Lextek also has other stand alone programs which have various functions, among which are: Onix Text Indexing and Retrieval Toolkit; Lextek Profiling Engine; RouteX Document Classifier; Brevity Document Summarizer; Lextek Language Identifier; PhonMatch Phonetic Toolkit

Apache Lucene is a Java-based high-performance text search engine library. Lucene Core is a Java library providing powerful indexing and search features, as well as spellchecking, hit highlighting and advanced analysis/tokenization capabilities.

Solr is an open source enterprise search platform from the Apache Lucene project. It operates as a standalone full-text search server within an appropriate servlet container, such as Tomcat. Solr uses the Lucene Java search library at its core for full-text indexing and search, and has REST-like HTTP/XML and JSON APIs that make it easy to use from virtually any programming language.