Roku was originally a project within Netflix called "Project:Griffin" but it spun off into its own company. Now, it's often hailed as the best streaming player for TVs, offering a complete, fast, and reliable experience. It's a great choice of a device for cord-cutters.
Almost every major live TV streaming app is available on Roku: Philo, Sling, Fubo, Frndly TV, Pluto TV, Xumo, Hulu with Live TV, and AT&T TV. These are all great cable alternatives, but from this list, you can find which one works best for you.