Prezto is abandoned. If you absolutely need a framework go for Zim, although I like the simplicity of Zplug and adding plugins or themes as I need them.
I stand corrected. Hadn't looked there in a while because the repo owner/maintainer had dropped off the grid for the better part of a year. Can't beat Zim it's speed though.. its even faster than Zplug despite Zim being a full framework and Zplug only a bare plugin manager.
Scroll down a bit and you'll see it.
Though I personally prefer zsh with prezto, because oh-my-zsh feels too bloated and heavy:
https://github.com/sorin-ionescu/prezto