This is a package for GNU Emacs that can be used to tie related commands into a family of short bindings with a common prefix - a Hydra. Once you summon your Hydra through the prefixed binding (the body + any one head), all heads can be called in succession with only a short extension. Hydra can be vanished with any binding that isn't the Hydra's head (and that binding will call a proper command too). This makes the Hydra very seamless, it's like a minor mode that disables itself automagically.