WebServers
Without it, the web just 'aint the same!
Sir Tim Berners-Lee likely had -NO- idea that this web thing would end up being so important. The most visible piece of this whole technology stack that makes "the web" a thing is the webserver itself. Do you know if your website is actually working while you're asleep or on vacation? Did your backend database just die and you're now losing sales?
Apache, IIS, Nginx, you name it, we've got you covered in actively watching your important website and it's related components to let you know if and when anything goes wrong.