Bukkit topic
Bukkit is a Minecraft server modification software and API, and while the original project itself is stale, forks like PaperMC and Spigot are actively maintained, and most plugins and servers use some variant of Bukkit.
ChestShop-3
ChestShop - the chest & sign shop plugin for Minecraft Servers running Bukkit/Spigot/Paper
BetonQuest
An advanced and powerful quest scripting plugin for Minecraft. Features built-in RPG style conversations and integration for over 30+ other plugins.
simple-voice-chat
A working voice chat in Minecraft!
AnarchyExploitFixes
Fix exploits on anarchy Minecraft servers
ExploitFixer
Bukkit plugin that aims on fixing Exploits in your Minecraft network. [Requires HamsterAPI to work]
WorldBorder
Bukkit plugin for maintaining borders for your worlds to limit their sizes, as well as generating missing chunks or trimming excess chunks.
AuraSkills
The ultra-versatile RPG skills plugin
BedwarsRel
Bedwars Reloaded - The Minecraft Bedwars Plugin!
Minepacks
Free and reliable backpack plugin for Bukkit/Spigot/Paper
BukkitOldCombatMechanics
Spigot plugin to configure combat mechanics from 1.9 onwards