Все веб-дизайнеры хорошо знакомы с InvisionApp — веб-сервисом, который помогает получать качественную обратную связь от клиента и демонстрировать результаты своей работы онлайн.
http://habrahabr.ru/company/sibirix/blog/197770/

Kirby is a file-based cms
Easy to setup, easy to use, flexible as hell

Mobify Performance Suite is a collection of automated features to make your responsive website significantly faster on tablets and smartphones.

This handbook is designed to give Web developers a way to approach designing accessible Web pages. Instead of simply being a checklist, it will guide you through ways of thinking about Web design in logical divisions.

The perceived speed of your website relies heavily on the browser being able to paint to your user's screen. For this they must construct a "render tree" which consists of the DOM and the often forgotten CSSOM.
The critical path which the browser takes to gather this information is the only thing standing between your server and the user's screen. Using new research and real world examples, Patrick Hamann will cover a range of techniques – from the controversial to bleeding edge – the Guardian is using to make their CSS load as fast as possible, and ultimately keeping it off the critical path.

Pow automatically serves static files in the public directory of your application. It's possible to serve a completely static site without a config.ru file as long as it has a public directory.

Very simple, you do not need to edit HTML, CSS, JS, PHP, ASP, JAVA, PERL, PYTHON, RUBY and a billion other technologies. Just open .html file and edit TEXT in it. The marked text you are reading is written as plain text. Open the 'View page source' and see it.

Чтобы создавать по-настоящему легкие сайты, не стоит заморачиваться на производительности, вместо этого, производительность должна рассматриваться как один из элементов дизайна.

This tool lets you combine icon webfonts for your own project. With fontello you can:
shrink glyph collections, minimizing font size;
merge symbols from several fonts into a single file;
access large sets of professional-grade open source icons.
Now it's trivial to make a custom icon webfont, exactly for your needs. First, select the icons you like. Then update glyph codes (optional), and download your webfont bundle. We generate everything you need, ready for publishing on your website!

When someone asks you for a web image that’s, say, two inches wide, they’re estimating how it would appear on their own monitor. Without changing the image’s pixel dimensions, that image would appear larger or smaller on different monitors—and would even look different on the same monitor at a different resolution setting.

CSS has been lacking proper layout mechanisms for far too long. Transitions, animations, filters, all of these are great and useful additions to the language, but they don't address the major problems that Web developers have been complaining about for what seems like an eternity.

Slow loading resources (images, scripts, etc) can break your code. Test it simulating unexpected network conditions applied to specific resource.

enquire.js is a lightweight, pure JavaScript library for responding to CSS media queries.

Ready-to-use virtual machines sporting open-source operating systems

Tipue Search is a site search engine jQuery plugin. It's open source and responsive.

PieCrust is a static website generator and lightweight CMS that’s all managed with text files. No complex setup, databases, or administrative panels. Simple, beautiful, and yummy.

The static site generators are so numerous, that I will not try to list all of them, but some selection, excluding the software which are only targeted to blogs. My selection may also be biased toward python.

It takes your markdown document and transforms it into the Shower slides. Almost all the things are transformed smoothly, however there could be some things you could configure, either in the YAML front matter or using some extra special formatting.

The easiest way for creative teams to think, imagine and discuss their ideas.

Smush.it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality. After Smush.it runs on a web page it reports how many bytes would be saved by optimizing the page's images and provides a downloadable zip file with the minimized image files.