I was not expecting either system to be mentioned but to update this information
itopz is a topsite
VDSystem is a server vote system
as the creator i gave the vote system free but made mandatory to use my topsite
https://github.com/nightw0lv/VDSystem
download free, needs an extensive configuration and all java versions to be installed so it can befully be build, but only if you plan to maintain the full solution for all projects
in case you want to use only 1 project you just copy the files for example frozen
https://github.com/nightw0lv/VDSystem/tree/master/Interlude/Frozen
copy paste inside your project, apply the patch of call the main class to gameserver.java and done.
note for active projects minor changes will probably be required
about the latest version hopzone.eu my other topsite is also required to have a server and get an api key same reason system is free, appriciate it.
there is a huge difference
that also extends as example in l2j
Note to the topic owner @zambog420 lucera is also an option specially if you feel coding ready with intellij