Complets
Complets is the set of useful stuff around Web Components than may help you to fulfill frontend framework requirements.
Structure
http/* - Http client abstraction and implementations
EventBus - Event bus abstraction and implementations
prefs - Portlet Preferences utilities
Renderer - Loads, cache and render native templates and operates with DOM
Registry - Dependency injector
Usages
Gridy-grid project uses Complets framework for WebComponents base operations.
https://bitbucket.org/techminded/gridy/src
Finistmart project uses Complets framework