Disclaimer
SkillAPI is released under the MIT license and the original author has not updated his work in almost 2 years now. My team and I are continuing the development of this plugin.

Moving Forward
Proskillapi is based on the original Skillapi forked by Sentropic.

Dependency Plugin (required)
You can download it here.

Some of PROSKILLAPI's Features

Cross server support with MySQL
Most powerful online editor of any skill creation plugin on Spigot!
- Create up to 16 triggers that activate skills like
- Set up to 9 targeters like Area, Cone, Linear, Self, etc
- Set up to 37 conditions to check for before a skill will activate like armor checks, chance, skill level, health, etc.
- Set up to 76 mechanics that give your skills their abilities
- There are literally millions of possibilities for creating your custom skills.
Create unlimited groups like class, race, etc.
Create separate names for mana for each class.
Set the mana regen speed for each class.
Create custom attributes like Stregnth, Vitality, Wisdom, etc.
Multiple sources for gaining experience like from mobs, block break, block place, craft, experience bottles, etc.
Set beginning stats for classes like health, mana and other attributes.
Set list of skills available per class.
Create custom gui menus for selecting classes, allocating attribute points, skill points, etc.
You can create classes with subclasses.
Limit with restrictions to what items are unusable per class.
API for developers to hook into.
Multiple casting options with skill bars, click combos and more
Create RPG style attributes, class requirements and more
Customize/change any command to suit your needs.
Full permission control for almost every feature.
Allow players to switch/create multiple accounts from 1 minecraft account. Also controlled with permissions.
Allow players to downgrade stats like skills and attributes.
Custom model data support for resource pack makers.
Set blocks to ignore from skills explosions
Check for class, level and attribute restrictions in item's lore (works on any custom items from any plugin)
Set to drop items if they don't have the correct levels, class, etc
Set inventory slots that are checked for bonuses.
PlaceholderAPI support with lots of built in placeholders that can be used on any plugin's menus that support papi.
Optional title messages for leveling up.
Multiple casting options including click combos and target visuals using particles to show you the direction your skills will be cast.
Set list of worlds that skills will not work in.
and a lot more!

Chinese translation of the editor: https://skillapi.ods.im/

Proskillapi (SkillAPI Continued)