Hi Dinkel,
not sure I understand you correctly, but I suppose you are talking about Simplifier Plugins. If so, from the Documentation:
Plugins are coded JAR Files that can be developed in the classic way like Eclipse, Netbeans or another Java IDE. The Plugins can be ran standalone and remotely and communicate with the Simplifier via akka message bus system over tcp. Every Plugin has its own port number and, if necessary, also its own ip addresses.
Plugins can be coded in any programming language, it’s only necessary that an HTTP interface will be provided.
Afaik, you cannot do this within the free trial. In case you are just looking for an easy way to run some script server side, you can make use of BusinessObjects. Those can only be written in JS though.
Hope that helps.