DebuGens is a modified version of Gens by Fuzzbuzz. It offers dumps for the ROM, RAM and YM2612 channels for debugging purposes, along with Tile Layer Pro palette creation and layer toggling options. It also allows for sprite and layer toggling which is good for getting screen captures of background images sprites.
File: DebuGens v1.25.7z (362 kB) (info)
Current version: 1.25