It has been fantastic seeing different development tools announcing their Tizen support and the next one to announce their love is Spell.JS which lets you create powerful and cross platform applications using SpellJS API's, with an easy to manage visual environment (Who doesn't want that).
You can download SpellJS at http://spelljs.com/download
The software supports HTML 5, Flash, iOS, Android and Windows 8 and now the version 0.9.2 supports Tizen platform. See the released notes below:
New Features (Version 0.9.2)
The HTML5 export is now fully compatible with Tizen. You can copy your HTML5 export directly into your Tizen Web Project and build a native app for the Tizen platform.(more info)