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Astro Colony Demo is using Tech Tree Designer for it's technology tree.

Graph Editor Extension for defining Widget Graphs for both layout and logic.

Easy to use editor

• Feels like any other build-in Unreal graph editor
• Add new nodes for tech / skills wherever you want
• Edit properties by selecting node
• Change layout style - background, lines, arrows, widget for nodes and many others 
• Get widget ready to use in UMG and Runtime!

Flexible

• Define your own skill struct or use the ones that already exists in your game
• Render tech / skill tree as you like by creating your own UMG widget for use in the skill tree, derived from a special UMG Widget providing everything you need.

In Game

• New Skill Tree Asset type for use in game
• A Slate and UMG widget renders the tree in game, you can add them anywhere in your UI
• Every function you need to work with skill trees will exposed to blueprints
• Save and load the state of a tech / skill tree in a regular Unreal Save Game without trouble