I just migrated my blog from tumblr.com to GatsbyJS and hosted it at Netlify. I setup my blog using gatsby-starter-lumen template. To migrate content from tumblr, I used this python script tumblr2markdown.py.
GatsbyJS is a static site generators engine, that are Progressive Web Apps, follow the latest web standards, and are optimized to be highly performant. It use the latest and popular technologies including ReactJS, Webpack, GraphQL.