We are starting a Java project named cantunethis which, in a basic description, will allow developers to edit properties of a game in real time.
The core library provides a way to let a game developer register values to be modified during the game, for example, the maximum speed of the main ship, or if the the orc spawner should be enabled or not.
Then, there is an optional editor, implemented using swing, which will automatically generate the corresponding GUI components for registered properties, for example, it will add sliders for float values, etc.
Here is the Github of the project.
One idea for the future is to be able to edit values remotely, so you could for example run your android game in debug mode which will open a sever and then the editor in your desktop machine will access it to modify your registered properties in runtime.
Another feature in mind is to allow developers to create their own custom GUI components for custom types (Color, Vector3f, etc).
The project is in alpha state, we want to hear your opinions and/or ideas before developing new features.