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 very latest packages. Debian Unstable is one of the 3 distributions that Debian provides (along with Stable and Testing). If you are a hardcore developer or tester you may opt use this release. The disadvantages – or rather challenges – are well known so I won’t go into those. However, here are some of the highlights of using Debian Sid. The Debian Project was first announced in 1993 by Ian Murdock, Debian 0.01 was released on September 15, 1993, and the first stable release was made in 1996. Best used with Vampire accelerators.