Super Castlevania Editor Orginaly Developed by RedGuyyyy more info to the project here RHDN_Forum Project Page
The wiki here has a manual to get you started with the editor!
The MegaEDX project was used to build Super Castlevania IV Editor on top off. The Megaman support was dropped but basic support for Gradius 3 and Contra 3 is added.
I try my best to improve the editor further.