Not the only one. My KVision framework has server side connectivity interface since version 0.0.13 and allows to build full-stack applications integrated with Jooby using a pure Kotlin code. There is not much documentation at the moment (I’m currently working on that part), but there are simple but comprehensive working examples available. Full-stack address book, integrated with Jooby, PostgresSQL, Kwery ORM and Pac4J security engine is up and running on Heroku.