I create a new micro-services web-application server base on gRpc-Web. I made use of it at work and it run like a charm. Services like persistence (mongoDB), storage (levelDB, Big Cache), SQL (mySql, ODBC), LDAP, SMTP are include as base service. You can also create your own micro-services. Binaries for Linux and Window are available.
Here is the link to that wonderful web-application server.