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I assume you mean beneficial to humans?
Viruses make up a large portion of Earth's ecosystem, and a large class of them help keep bacteria in check.
https://en.wikipedia.org/wiki/Bacteriophage
There are even efforts to try and harness them to treat bacterial infections.
https://en.wikipedia.org/wiki/Phage_therapy
Additionally, a good chunk of our DNA is from ancient viruses, so homosapiens wouldn't be what we are today without viruses.
That's the case for most species.
As a very specific and highly functional example of critical viral proteins in other organisms, there wouldn't be any placental mammals without viruses. https://en.m.wikipedia.org/wiki/Placenta