The first release is coming up! I've been working on this tool for about a week now. The frontend is written with React.js, Redux, Redux-Saga, Sass and is Bootstrap-themed.
The backend is built with Vert.x in Kotlin, running on a digital ocean VPS with Postgres as database.
Authentication is done via Auth0 to keep it simple.
I'm curious if anyone else is interested to use it in their tools.