Templates

• getbootstrap.com
• Bootswatch.com
• startbootstrap.com - excellent
• wrapbootstrap.com
• bootstrapzero.com
• ThemeForest

Snippets

• bootsnipp.com - snippets to get ideas
• Onsen UI - web components for Mobile Devices
• Mobile Angular UI - Front End Framework using Bootstrap + Angular

HTML5 Showcase

• HTML 5 rocks - Ideas and resources for HTML5

Fonts

• Google Fonts -
• What font! Web font - WhatTheFont to retrieve font from image
• WhatTheFont! -find font from image
• Cheatsheet for Glyphicons and Font-awesome -
• Simple Line icons

Angular

• Angular UI - Bootstrap components written in pure AngularJS by the AngularUI Team
• Angular strap - AngularJS 1.2+ native directives for Bootstrap 3.

Patterns

• Subtle Patterns
• Color palettes

Images

• Gratisography - free images

Online Image Editors

• Online-Image Editor - : supports transparency (here)
• Lunapic - for negative of images (supports PNG)
• CutMyPic.com - image cropping

Misc

• Generate Favicon - 16x16
• Draw favicon
• Color picker of w3 School
• Combine PDFs
• PDF buddy - but need account
• Video Hive - for videos