The μA741 is still manufactured and it historically was a jellybean part, but I'm not sure it counts as one today. The performance is low and it's not something anybody is likely to use in new designs. I think the LM358 is a better example of a jellybean part. It's cheap and widely available and still commonly used, mostly because unlike the μA741 it works with a single-ended 5V supply (the μA741 needs both +5V and -5V).