This week's book giveaway is in the Spring forum. We're giving away four copies of Pro Spring MVC with WebFlux: Web Development in Spring Framework 5 and Spring Boot 2 and have Marten Deinum & Iuliana Cosmina on-line! See this thread for details.
did you consider a complete portal solution? There are few OSS with its Enterprise support (e.g. Liferay, eXo platorm, etc. , but I'm not sure if they can provide an on site installation), but if you need a heavilly supported product, what about IBM Portal Express? (for its price, of course)