Online version of Terrarium running your browser. This allows you to play Terrarium online (ecosystem mode onlly) without the need for a desktop client. You can still upload creations either through your client or this interface and they end up in the same place. This allows you to view what's happening in Terrarium any time and can be played on a mobile device or (modern) desktop browser.
Terrarium is a continuation of the .NET Terrarium project on CodePlex