From Gentoo Wiki
- Basic guide to write Gentoo Ebuilds — getting started writing ebuilds, to harness the power of Portage, to install and manage even more software.
- Submitting ebuilds — explains how to submit ebuilds for inclusion in the Gentoo ebuild repository, through the Bugzilla bug tracking web application.
- Package Manager Specification — a standardization effort to ensure that the ebuild file format, the ebuild repository format (of which the Gentoo ebuild repository is the main incarnation), as well as behavior of the package managers interacting with these ebuilds is properly agreed upon and documented.
- Portage — the official package manager and distribution system for Gentoo.