There are cameras inside and outside the International Space Station which you can watch live below.
The International Space Station is regularly visible above earth at night by eye! Heavens Above is the most comprehensive site I've found for working out when it's going to be visible. Make sure to tell it your location at the top right of the page, otherwise it will assume you're stood in the middle of the atlantic and give you incorrect data.
Live Feed from SpaceX's first launch of humans in their Crew Dragon spacecraft.
HD Video. Scheduled pre-recorded content, but covers ISS events (spacewalks, media interviews, educational broadcasts) and some rocket launches live.
This is NASA TV's Second channel
Live video, from the High Definition Earth Viewing System. It mainly shows views of Earth from the station exterior but sometimes shows inside and spacewalk coverage. Audio is of communications between Mission Control and ISS.
I'll add more video feeds as I find them, so watch this space!