I think the telephone sort of fits. It's attributed to Bell but that's mainly because he wiggled his way into a US patent before his competition. The telephone has many fathers though: Bourseul, Manzetti, Reis - just to name three. The latter is also the father of the word telephone but died before it took off. There were many engineers tinkering so if Bell hadn't taken the crown, another person would have done it.
Bonus answer: penicillin. Alexander Flemming. A lucky, accidental discovery. If mold hadn't gotten sloppily into his cultures we might all have died of the plague or something nice like that.
I suspect this is a problem of fragmentation on Android. I've had issues when I tried other Clock apps than the Google one. Alarms would not be triggered for various inexplicable reasons. Or they reset if the launcher crashed for whatever reason. I don't have the time and energy to test this simple function that I rely on quite heavily. And that's why I stick with the stock Google app because it has never failed me personally no matter whose manufacturer's version of Android it ran on.