elebase - Have a fully operational back end, in less than an hour.
Payara Server - Payara Server is a fully supported, developer-friendly, open source application server. Innovative, cloud-native, optimized for production deployments. Jakarta EE & MicroProfile compatible.
Dark Language - Holistic language, editor, and infra for building backends
JBoss - JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server.
AWS Lambda - Automatic, event-driven compute service
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies