At the moment, DuckDuckHack has 687 live Instant Answers. DateMath and DaysBetween are slick (and will save me trips to Time And Date). Here are examples of DateMath and DaysBetween, respectively:
I also noted TimezoneConverter, Timer (e.g. timer 5m), Stopwatch, Random Choice, Random Number, News, and Rhymes.
For awhile, I’ve had DuckDuckGo as my primary fallback search in Alfred, and this is a reminder for myself that accessing these are a few keystrokes away. 😎