Alternatives and similar repositories for XSeries:

Users that are interested in XSeries are comparing it to the libraries listed below

• juliarn / npc-lib
  Asynchronous, high-performance Minecraft NPC library for 1.8-1.21 servers.
  ☆339Updated this week
• TriumphTeam / triumph-gui
  Simple lib to create inventory GUIs for Bukkit platforms.
  ☆360Updated this week
• MrMicky-FR / FastBoard
  Lightweight packet-based scoreboard API for Bukkit plugins, with 1.7.10 to 1.21.4 support.
  ☆504Updated this week
• lucko / helper
  A collection of utilities and extended APIs to support the rapid and easy development of Bukkit plugins.
  ☆455Updated 7 months ago
• stefvanschie / IF
  An inventory framework for managing GUIs
  ☆429Updated this week
• WesJD / AnvilGUI
  Capture user input in Minecraft through an anvil GUI in under 20 lines of code
  ☆493Updated last month
• NichtStudioCode / InvUI
  A spigot library for creating custom inventory-based GUIs.
  ☆269Updated last week
• Revxrsal / Lamp
  A modern annotations-driven commands framework for Java and Kotlin
  ☆232Updated this week
• InfernalSuite / AdvancedSlimePaper
  Advanced Slime World Manager as a Paper Fork
  ☆277Updated last month
• Exceptionflug / protocolize
  A lightweight BungeeCord / Velocity protocol framework supporting items
  ☆319Updated last month
• cijaaimee / Slime-World-Manager
  A Spigot plugin that implements the Slime Region Format.
  ☆272Updated last year
• kangarko / Foundation
  Foundation™ helps you create highly customized Minecraft plugins (based on Spigot/Paper API) that support multiple MC versions.
  ☆360Updated this week
• ByteZ1337 / ParticleLib
  Multiversion spigot library supporting all particles and their data (1.8-1.19.3)
  ☆272Updated last year
• KyoriPowered / adventure
  A user-interface library, formerly known as text, for Minecraft: Java Edition
  ☆742Updated last week
• Paul19988 / Advanced-Slime-World-Manager
  A Spigot plugin that implements the Slime Region Format.
  ☆186Updated last year
• CommandAPI / CommandAPI
  A Bukkit/Spigot API for the command UI introduced in Minecraft 1.13
  ☆569Updated last week
• Incendo / cloud
  Command framework & dispatcher for the JVM
  ☆452Updated this week
• MinusKube / SmartInvs
  Advanced Inventory API for your Minecraft Bukkit plugins.
  ☆263Updated 8 months ago
• hpfxd / PandaSpigot
  Fork of Paper for 1.8.8 focused on improved performance and stability.
  ☆280Updated 3 weeks ago
• JitseB / NPCLib
  (Minecraft) NPCLib – Basic non-player character library.
  ☆195Updated last year
• retrooper / packetevents
  Precision meets performance—a powerful tool for mastering Minecraft packet manipulation with speed and finesse.
  ☆595Updated this week
• Exlll / ConfigLib
  A Minecraft library for saving, loading, updating, and commenting YAML configuration files
  ☆153Updated 11 months ago
• tr7zw / Item-NBT-API
  Add custom NBT tags to Items/Tiles/Entities without NMS!
  ☆580Updated last month
• MegavexNetwork / scoreboard-library
  Powerful packet-level scoreboard library for Paper/Spigot servers
  ☆169Updated this week
• unnamed / hephaestus-engine
  Render, animate and interact with custom entity models in Minecraft: Java Edition servers
  ☆187Updated this week
• Alvinn8 / paper-nms-maven-plugin
  A maven plugin for using NMS on paper with Mojang mappings.
  ☆129Updated 3 weeks ago
• MockBukkit / MockBukkit
  MockBukkit is a mocking framework for Bukkit/PaperMC to allow the easy unit testing of Bukkit plugins.
  ☆634Updated this week
• dmulloy2 / PacketWrapper
  Packet wrapper classes for ProtocolLib
  ☆175Updated 6 months ago
• gabber235 / TypeWriter
  The next generation questing in minecraft
  ☆268Updated this week
• Elytrium / LimboAPI
  An API which provides virtual servers features to Velocity
  ☆251Updated 2 weeks ago