coAdjoint Action
参考：
coAdjoint Action – RPG Skillpoint System | Unity Asset Store [Official]
coAdjoint Action – RPG Skillpoint System | Unity Forum
Why Action is Better in 3.5 Minutes – YouTube
Skill Based Leveling System (SBLS)
参考：
Skill Based Leveling System (SBLS) | Unity Asset Store [Official]
Tech Tree Tool
参考：
Tech Tree Tool | Unity Asset Store [Official]
Activation Graph System
参考：
Activation Graph System | Unity Asset Store [Official]
Activation Graph System – Mission, tech, building, skill tree solution | Unity Forum
Building/Crafting Example – YouTube