Please make sure you are posting in the correct place. Server ads go here and modpack bugs go here
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If I think I get what you want, then the anwser is: there exists no such thing.
As far as I know, either you download the server files and put your plugins in there (following plugin install instructions) ór use server managing software (like McMyAdmin) and use their 'easy' plugin system.
(If you use McMyAdmin and want to run the DW20 server, download and unzip the server files in the location the documentation of McMyAdmin says, then rename the server jar file to the one McMyAdmin can read/use)