Rate: 
Current Version: 2.0.4885 Release Candidate 2
Ace2 is an embeddable framework for rapid mod development.
Features:
- 100% embeddable. An Ace2 addon should never require Ace2 as a dependency.
- Provides the following modules:
- Ace00 - Provides a fully functional object oriented framework. - Documentation
- AceLibrary - A global versioning library to handle other library instances, upgrading, and access. - Documentation
- AceEvent - A mixin to allow for centralized event handling. Also allows for custom psudo-events. - Documentation
- AceHook - A mixin to allow for safe hooking of functions, methods, and scripts. - Documentation
- AceDB - A mixin to allow for fast, clean, and feature filled saved variable access along with customizable profiles. - Documentation
- AceDebug - A mixin to allow for simple debugging capabilities. - Documentation
- AceLocale - A localization library for addons to use to handle proper localization and internationalization. - Documentation
- AceConsole - A mixin to allow for chatline input/output capabilities. - Documentation
- AceAddon - A basis for addons to use that can accept mixins and handles initialization events. - Documentation
- AceModuleCore - A mixin to provide a simple modularization framework. - Documentation
A Couple of Notes:
- Pretty much this file is for developers to use. End users can run it if they wish. However by itself it doesn't do much.
- Ace2 will not work as a dependency for Ace 1.x based addons, however they can work side by side very well.