> The Apache Tika™ toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF). All of these file types

> The Apache Tika™ toolkit detects and extracts metadata and text from over a thousand different file types (such as PPT, XLS, and PDF). All of these file types can be parsed through a single interface, making Tika useful for search engine indexing, content analysis, translation, and much more. I'm currently using the HTTP server interface to extract and index metadata and content from screenshots, html files, and pdfs. Posting a file to /meta endpoint extracts the metadata and posting the file to /tika endpoint does OCR and text extraction from screenshots, html, and pdfs which I then store in a content addressable way (using SHA256 hashes) in files and in CouchDB for easy searching. In theory Solr can also be used for the same purpose but I haven't tried that yet.