Tools
BGB

http://bgb.bircd.org/ (external link)

By Bas Steendijk

Media:
Gambatte

https://sourceforge.net/projects/gambatte/ (external link)

By sinamas

Media:
gambatte-speedrun

fixes some flaws of memory emulation present in version r571 (external link)

By Dabomstew

Media:
SGB time converter

Easily convert your Super Game Boy 1 times with this simple webapp! (external link)

By Nudua

Media:
SML2 Randomizer

http://sml2r.download/ (external link)

By slashinfty

Media:
Saves
v1.2 Save File

File A has all non-boss and non-secret levels cleared for practice on any level. File B has 99 lives and all bosses cleared for practice on Wario's Castle. v1.2 ROM only. (direct download)

By pidge/slashinfty

Media:
Splits
Any%

Level splits (LiveSplit) (external link)

By slashinfty

Media:
Any% Glitchless

Zone splits (LiveSplit) (external link)

By slashinfty

Media:
Patches
None yet