It depends on your definition of a hero.
I like the second one.

Quote:HERO:
1. In mythology and legend, a man, often of divine ancestry, who is endowed with great courage and strength, celebrated for his bold exploits, and favored by the gods.
2. A person noted for feats of courage or nobility of purpose, especially one who has risked or sacrificed his or her life: soldiers and nurses who were heroes in an unpopular war.
3. A person noted for special achievement in a particular field: the heroes of medicine. See Synonyms at celebrity.

A hero for me would be a person who acted in a selfless manner to achieve a greater good for others.
Most of heros sacrifice their life for a single goal.

The examples in the first and third categories are plenty in the computing field but I can't find much if any in the second one.