asdf-k14s 
k14s plugin for asdf version manager
Install
asdf plugin-add <ytt|kbld|kapp|kwt|vendir|imgpkg|json2k8s> https://github.com/k14s/asdf-k14s.git
Use
Check out the asdf readme for instructions on how to install and manage versions of tools from k14s.
Thanks!
Special thanks to @johnhamelink for starting this up.