This week's mobile product development resources:

ChaiOne teached us the role of wireframing in mobile application design.

PonyFoo wrote a comprehensive introduction and review that can assist in making a choice between Gulp, Grunt or npm.

The Sencha Blog published an interesting training tip, about how to use custom fonts with Sencha Architect.

SmartBear showed us what the best practices of context-driven testing are.

Carlo M. Icaza converted the Swift Apple books (initially designed to be read only using iBooks) to PDFs. Download The Swift Programming Language and Using Swift With Cocoa and Objective-C from his blog.