What can I use to make a 'Progressive web application'

Answer 1

Vaadin. It’s a full stack Java framework.
https://vaadin.com/pwa

Answer 2

https://www.outsystems.com/p/build-for-free-pwa/?utm_source=google&utm_medium=cpc&utm_campaign=EMEA_Search_PWAs&utm_term=%2Bprogressive%20%2Bapp&utm_content=Try-for-free&gclid=CjwKCAiAxKv_BRBdEiwAyd40N8B-ONoSlrkx3DN920mdsTyJoPZvRF9GqVrv8vSEosTiyKU5dxYU6RoCKRsQAvD_BwE