What is render.figure-eight.io?

So I was just going through the acquisition report on the google analytics for my website for the previous day. Soon as the clock tick 00:00, I hop on to the dashboard to see what all happened the previous day. The acquisition report showed two visits from render.figure-eight.io/referral. I searched on google but couldn't exactly understand why do I have a referral from them. Can anybody help me understand what it is?

*I didn't know which forum to post thread relating to this in. If I have posted it on the wrong forum, mods please move it as per the correct one. Thank you and sorry!

I get a lot of those randoms too... who knows, scrapers, indexers, email spammers, manufacturing companies to name a few ideas