Trying to follow along with wso2's how-to-write-a-web-application-backed-by-wso2-middleware-part-1 which is their up-to-date introduction for it, but it is 4 years old. One of the steps is downloading and installing the DSS, but the documentation states that this is . But I cannot find any tool by which this has been replaced. Not in AM nore EI.
Also all DSS-related questions here are more then 3-years old.
What is the new DSS?
Data services server (DSS) is now a part of WSO2 EI. You can find the documentation here.
https://docs.wso2.com/display/EI640/Working+with+Data+Services