The X1 Search application will display highlighted text in a preview panel. It can index and preview DOCX, PDF, XLSX etc, but not ebook types like EPUB, LIT etc. Its primary target is large multi user environments.
I used X1 for a while on a business development project, when the project became a LOB function we outsourced it to a 3rd party. When X1 switched to SaaS pricing I decided I could live without it. We hooked X1 into calibre via the Drop Search Results plugin, which also works with similar tools like Windows Search, File Locator Pro, etc.
I've attached a screenshot from the X1 site.
BR
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