There's also bash-it, for those who want a similar framework but don't want to move away from bash for whatever reason/s:

https://github.com/Bash-it/bash-it

I used bash-it for a long time early on. I was intimidated by switching to the unfamiliar territory of zsh, but it's a no-brainer now and I'd struggle to live without its features that I have since taken for granted.

I moved from OMZ to Antigen, how does Prezto compare to Antigen if you've tried both?