The software that powers this account is called anonmicroblog. Use it for creating shared identities, where you want to post something without attribution (anonymity set is not well known, it's anyone who knows the password), but you don't want to just post to an anon board full of irrelevant spam.
This identity's private key is calculated in JavaScript in your browser and it creates a Nostr post. This shared identity can thus be followed on Nostr as any other account (like me!), but you can use projects such as Oracolo or Npub Pro to turn them into websites, making it useful for people who are not on Nostr yet.