dtsearch - dtSearch - The Smart Choice for Text Retrieval since 1991.
FYI - Find your documents, like magic 🔮
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Findo - Your smart search 🔍 assistant across personal cloud ☁️
SearchMyFiles - Alternative to the standard Search For Files And Folders module of Windows. Duplicates search is also supported.
Vaultedge - Access all your documents in one place.