Core2 SDK is a rebuilding of FLCoreSDK. The original FLCoreSDK was very useful but suffered from some major drawbacks:

• Most virtual functions unusable due to incorrect position
• No determination of class inheritance hierarchy
• No reversal of non-exported classes
• No determination of member fields

The Core2 SDK Project aims to fix or at least alleviate these limitations by undertaking a more thorough analysis of FL's binaries, and in addition, take reversal "beyond" just the exported engine pieces to make even more advanced plugins and modifications possible.

Obviously a 100% accurate recreation of FL's source is impossible, but most functionality can still be determined or deduced. If you wish to contribute your own work to this project, feel free to submit a pull request.