Zebra's Toggle Sneak&Sprint by BlauesZebra
Sneak and sprint keys behave as if they can be locked into the pressed state and unlocked by pressing them again. The function can be enabled/disabled ingame by pressing other configurable keys. Have a look into the Controls section.
Zelda Sword Skills by coolAlias
The ultimate Zelda mod, adding nearly everything from the Zelda series to Minecraft.
ZeroPoint's Teacher Appreciation Week Gift by Zero Point
Made during Teacher Appreciation week - in school, no less!