From Gentoo Wiki
- Equery — a tool to make several common Portage operations simpler.
- Eclean — a tool for cleaning repository source files and binary packages.
- Epkginfo — a tool used to display package metadata information.
- Q applets — a collection of small, fast Portage query utilities written in C.
- Useful_Portage_tools — a list of helpful Portage-related tools.