What are sources available to get features of web application development technologies

I’m building an app which collects features of different web application technologies. What sources I can use to get features of different technology solutions like elastic search, Java, angular, Apache.

example

java ==> robust, secure, multithreaded elastic-search => Scalable Map/Reduce model, REST based

I'm trying to automate the process of indexing features of technology solutions in to a database so It would be better if the source is a website or forum.