Debian versions before version 1.1 were all development versions. The Debian 0.01 was done in August 1993.
Debian 1.0 was not really version 1.0. It was an early development version released by a mistake by a CD vendor, InfoMagic, in December 1995. Personally my first experience with Debian was version 3.0. I found that one difficult to install. It either changed or I knew a little of what I was doing when they released version 3.1 and everything became a lot easier. I tried out some other distributions too, like Fedora, OpenSuse, Mandrake and even Ubuntu. But always came back to Debian. Debian just feels right.
As a little fun fact. All Debian releases are named after Toy Story characters.
Debian versions list
Debian 1.1 Buzz – released June 17th, 1996. Actually the first real Debian release as version 1.0 was not version 1.0. And they named the new version 1.1 to avoid confusion about the earlier development release.
Debian 1.2 Rex – December 1996.
Debian 1.3 Bo – June 1997.
Debian 2.0 Hamm – July 1998. For the first time supports the 68K motorola series processors.
Debian 2.1 Slink – March 1999. Alpha and SPARC was added to this version as well.
Debian 2.2 Potato – August, 2000. PowerPC and ARM was added.
Debian 3.0 Woody – July, 2002. IA-64, HP PA-RISC, MIPS and S/390 support was added. Also first version to include KDE.
Debian 3.1 Sarge – June 2005. Unofficial support for AMD64. And the release of they new debian-installer. OpenOffice was also included for the first time.
Debian 4.0 Etch – April 2007. Official support for AMD64 and Motorola 68K series was dropped. Graphical installer was added for the first time.
Debian 5.0 Lenny – February 2009. ARM support was removed and the new ARM (ARM_EABI) was added. Sun Java was added for the first time.
Debian 6.0 Squeeze – February 2011. Alpha and HPPA was dropped.
Debian 7.0 Wheezy – May 2013. Support for armhf was added.
Debian 8.0 Jessie – April 2015. Current version.
Debian 9.0 Stretch – Unknown.
To get Debian, please go to https://www.debian.org
It is in my opinion the best Linux Distro out there for servers. And the gold standard in stability. You might not find all the newest linux packages with Debian. But you will have a rock solid server setup. Not a bad desktop OS either.
Thats it for Debian versions.