antigen logo antigen
antibody logo antibody
antidote logo antidote

The short version:

The original Antigen plugin manager was slow. Antibody was written to address this, but was written in Go, not Zsh. Other native Zsh plugin managers caught up on speed, so it was deprecated. But Antibody had some nice features that aren’t in other Zsh plugin managers. So Antidote was created to carry on as the next generation of antigen-like Zsh plugin managers.

See also: