Google Desktop. https://en.m.wikipedia.org/wiki/Google_Desktop https://en.m.wikipedia.org/wiki/Google_Desktop But it was... (Wait for it) Discontinued. Som

Google Desktop. https://en.m.wikipedia.org/wiki/Google_Desktop https://en.m.wikipedia.org/wiki/Google_Desktop But it was... (Wait for it) Discontinued. Something about not being aligned with their cloud strategy IIRC. It didn't OCR, but indexed emails, documents, visited pages by content, etc. (And enriched your normal Google search results - if it had permission). Was quite awesome. It had a I-remember-something-else-that-day mode of search where you could find an email or doc from that day and then look for other items indexed on the same day/hour.