Cavehacker101

I know, I think you're able to change yours since you've made 10 posts.

http://www.cavestory.org/forums/index.php?showtopic=833
Or for the *finished* version...
http://www.cavestory.org/forums/index.php?showtopic=911

Whoops... sorry...

Ahh... why wouldn't it be?
People help each other out all the time here.

Duuude.
You finally got a profile. We'll see if we can both work on a mod together now.

Define "tools"
For one, there's a feature in Cave Editor that lets you modify various weapon attributes like damage and number of impacts and behaviour flags.
For anything else, we use Ollydbg and maybe if you're really keen the Doukutsu Assembler. There isn't any kind of custom tool or software for this stuff.