Best Server Utility MODS For Minecraft (Forge).

I've combined all the Feed the Beast Mods (FTB) together because they work well together and can rely on each others for full functionality. They're what I currently use for a modded Minecraft server! My main complaint is the lack of documentation for certain mods. Just something to keep in mind for consideration.
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FTB Backups Game Versions 1.12, 1.14 and 1.15. 1.16 Creates backups for servers when players are online to reduce clutter.

FTB Quests Game Versions 1.12, 1.15 and 1.16 This mod is great for those who want a server with quests. It makes it easy to create quests for players.

FTB Chunks Game Versions 1.15, 1.16 This mod includes its own world map as well as a minimap. It also allows players to claim chunks. Only players with whom the player has allied will be able affect or interact with the blocks in the claimed region. I highly recommend using in conjunction with FTB Teams for full functionality.

FTB Teams Versions: 1.15 and 1.16 This mod gives the ability to create teams. On its own, it's not very impressive, but matched with FTB Chunks and FTB Quests, servers run smoothly.

FTB Ultimine Versions: 1.12, 1.15, 1.16 This is an excellent VeinMeiner option for newer version. Players can harvest multiple blocks simultaneously by using a configurable key. You can also create a whitelist to allow players to harvest blocks from the server.

FTB Essentials Game Version 1.16 This mod adds utility command that are essential for running and maintaining a server. It allows players to teleport to one another, change nicknames, set homes, and more!

FTB Ranks Game Versions: 1.15, 1.16 This is essential if you want to enable permissions on a server. It is possible to set ranks for new players and moderators.