ServerTools-CORE by matthewprenger
Adds a variety of useful tools for Minecraft server administrators
BetterDeathScreen by BlayTheNinth
Adds a chat box to the death screen, among with some useful commands. Companion mod to Hardcore Revival.
Creeper Temper by Vazkii
Creepers turn red as they start to ignite, if they're too far to ignite they'll always be green. Stay safe!
Lit Launch by Codetoil
An api to allow you to use the same mod with many different modloaders(e.g. Forge or Fabric). This also allows for different versions of the modloaders. (i.e. the same mod on 1.7.10 and 1.14.4)
OreExcavation by Funwayguy, Darkosto
Allows players to mine whole veins of ore, cut down whole trees or any other tool based action in one go. Simple easy to understand configs are also provided for mod pack developers