Radix Icons - A crisp set of 15×15 icons. Open source.
Topstyle - TopStyle contains powerful tools for building standards-compliant web sites.
Drawcon - Draw your own app icons
Stylizer - A productivity-focused real-time CSS editor for serious web developers. Mac OS X and Windows.
App Icon Template - Royalty free app icon creator for iOS, OS X and Android
EnjoyCSS - CSS generator for rich graphical styles without coding