These are the old Nick Jr websites from 1999-2012, aka the hallmark of nostalgiakidssites.com.

1999-2000 Nick Jr Website

2000-2004 Nick Jr Playtime

2004-2009 Nick Jr Playtime

2009-2010 Nick Jr Playtime

2010-2012 Nick Jr Kids Website

Noggin Websites

2004 Noggin Website

2007-2009 Noggin Website

Credit to Nostalgivault, Raymond Haun, ThatDoraGuy, Co M 88, Alexis M, and Rare Noggin Stuff.