Hasura GraphQL Engine is one of the open source tools we're using for the Nhost stack. But it's "only" one of the open source technologies we're using.
Others are:
- Postgres. Who doesn't love Postgres?
- Hasura Auth: https://github.com/nhost/hasura-auth
- Hasura Storage: http://github.com/nhost/hasura-storage
- Serverless Functions (Node.js)
On top of that we have SKDs in JS/TS/React/Next.js/Vue.
And a CLI for local development and a GitHub integration so you can deploy your backend just like you deploy your frontend with Netlify and Vercel.
Hope that clarifies a bit.