Two years ago I became a dad; and, with that I actually started checking into what blogs and techy stores suggest for Father's Day. In my opinion they all suck - unless you're a hipster nerd, or all about little gadgets. This is my attempt at a gift-idea roundup of badass stuff fellow web developer dads could truly enjoy.
The Complete Smashing Library. I purchased the Smashing Library for myself, and it is incredible. Coming in a $99 for over 50 eBooks (plus any future releases), the value is intense. For the price of buying two books your local bookstore (and more knowledge IMO) this definitely hits #1.
Web Dev Swag. I hate nerdy shirts - unless its supporting some of my favorite services I use. Here's some popular services or software that a web developer would be proud to sport: GitHub, Codepen, WordPress,
Sublime Text License. Sublime Text is a badass text editor that can be extended to put on all the bells and whistles. It isn't free, but it sports a unlimited-time "trial." Every so often after you save a document the "Purchase a License" dialog comes up. The license is $70, but it'll put one hell of a smile on his or her face.