CadEditor

Building Build all projects from CadEditor.sln solution

Running Run CadEditor.exe, select config file for game that you want to open and select ROM file to edit (ROM files must be downloaded separately).

Important: if you download release archive from github, you must unblock it for correct running EXE and DLL files https://blogs.msdn.microsoft.com/delay/p/unblockingdownloadedfile/ More explanations: http://www.romhacking.net/forum/index.php?topic=17150.msg356786#msg356786 You can use installer to avoid this problem.

CadEditor is a universal level editor and some romhacking tools for many different games for NES and SMD platform.
Some of them:

Chip & Dale 1-2, 
Darkwing Duck,
Duck Tales 1-2
MegaMan 3-5
Tale Spin
Little Mermaid
Jungle Book
Flintstones
Contra Hard Corps
Earth Worm Jim 1-2
Pitfall
etc.

There are more than 2000 configs for more than 200 games.
Configs are simple C# files, and they have simple structure, so new games can be added with no problems.
Full list of supported games:
https://github.com/spiiin/CadEditor/blob/master/CadEditor/cad_editor_supported_games.txt