Pixelmon X Plugins

I'm looking to add some basic plugins to my server, my server is running Technic Pixelmon Reforged Pixelmon 8.3.5. Which server software would be the best to use for this? Also, how would I re-add the Pixelmon modpack to the server after enabling something like Spigot or Bukkit?

Ah darn, alright. Thank you for the quick response! Do you know another way I could install the Pixelmon pack as individual mods to allow me to use plugins? I'm just looking to add the basic /sethome and /tpa to the server! Thank you in advance!