Hi! Can you please add KeepChunks for Spigot/Bukkit software. I have seen you denied it about a year ago because of the external link
. I think they removed it and made it a normal link so maybe now you are able to add it... Thank you in advance!! 
Plugin name: Keepchunks
Plugin link: https://www.spigotmc.org/resources/keepchunks.23307/
Description: This plugin allows you to have chunks loaded for an unlimited time in order to keep your automatic farms, redstone circuits and minecart railways working even though no players are near. It is useful if you don't want to work at the spawn chunks.