Debian Long Term Support
Debian Releases

Debian - Distribution Archives
http://archive.debian.org/

snapshot.debian.org The snapshot archive is a wayback machine that allows access to old packages based on dates and version numbers. It consists of all past and current packages the Debian archive provides.

Debian LTS FAQ

Debian Package debian-security-support

Debian Unstable (also known by its codename “Sid”) is not strictly a release, but rather a rolling development version of the Debian distribution containing the latest packages that have been introduced into Debian.

Debian Ports overview of all the CPU architectures that Debian runs on (officially, and unofficially).

Debian Ports (unofficial) The goal of this machine is to provide an infrastructure for unofficial architectures until they are integrated in the main Debian archive. ISO images available in Debian - cdimage - ports, and Debian - cdimage - ports - snapshots.