sherpa is a the package management system for ODIE. It live as a Tcl script installed right along side the tclsh built by odie. (Usually ~/odie/bin).
sherpa's package list is located in ~/odie/sandbox/odie/recipies. It is updated every time the fossil repository for odie is updated. In addition to the packages bundled with odie, users can add their own recipes. The best place is to create a file ~/odie/etc/sherpa.rc and add to it:
foreach file [glob CUSTOMDIRECTORY/*.tcl] {
source $file
}