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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.
Additionally, a good chunk of our DNA is from ancient viruses, so homosapiens wouldn't be what we are today without viruses.
There are viruses that make some plants look more appealing to some people. For example they are the cause of these striped patterns on tulip petals.
Viruses affect other things too, including bacteria! Bacteriophages are the first to come to mind
https://m.youtube.com/watch?v=SbvAaDN1bpE
Sorry to link to a video, but this recent Kurzgesagt video covered your question pretty closely :)
Some viruses are useful for studying genes - you can make them transfer a genetic sequence into a cell.
They can be used in gene therapy - a very promising field of medicine.
And some viruses could also be used instead of antibiotics, which could potentialy solve the resistence problems and also help avoiding collateral damage to symbiotic bacteria. (Research of this technology is quite old, unfortunately it was abandoned for a long time and everyone focused on antibiotics instead.)
https://www.youtube.com/watch?v=YI3tsmFsrOg
There are beneficial bacteriophages for humans and other animals and plants.
There is the "Luck Virus" and "Sexual Magnetism Virus" poor Rimmer
This has made Mr Flibbles very cross!
I had hoped a few would get this
Probably, yeah. Their whole schtick is to move DNA around and fuck up genomes n shit. They’re evolutionary drivers.