Dr.Explain - Dr.Explain software is a help file authoring tool.
UI Movement - The best UI design inspiration, daily
MadCap Flare - Documentation for Any Audience, Language or Format
UI Garage - Specific mobile and web design patterns for your inspiration
HelpNDoc - What is HelpNDoc ? Easy to use yet powerful help authoring environment which can generate various documentation formats from a single source.
CodeMyUI - Handpicked code snippets you can use in your web projects