Minecraft wiki entry for Version_history, associated text: Version history
Pre-classic (May 10 – May 16, 2009)
Classic (May 16 – November 10, 2009)
Indev (December 23, 2009 – February 23, 2010)
Infdev (February 27 – June 30, 2010)
Alpha (June 30 – December 3, 2010)
Beta (December 20, 2010 – November 11, 2011)
Official Release, or Java Edition (November 18, 2011 – present)
Development versions (September 9, 2011 – present)