• Facebook Social Plugins Sandbox (superdoc)
• jaybonci's sandbox (superdoc)
• in10se's sandbox (superdoc)
• mauler's Sandbox V: Sandbox Harder with a Vengeance (superdoc)
• in10se's sandbox 6 (superdoc)
• Popular Registries (superdoc)
• in10se's sandbox 3 (superdoc)
• mauler's Sandbox III: Son of Sandbox (superdoc)
• The sandbox, it is full of shit (category)
• mauler's Sandbox IX: Nine is Fine (superdoc)
• SS-N-12 Sandbox
• sandbox
• in10se's sandbox 4 (superdoc)
• This is my universe. Go find your own sandbox.
• I One the Sandbox
• Reputation Graph Horizontal (superdoc)
• The Sandbox
• Oolong's sandbox (superdocnolinks)
• virtual sandbox
• Reputation Graph (superdoc)
• Magical Writeup Reparenter (superdoc)

If you Log in you could create a ""sandbox"" node. If you don't already have an account, you can register here.