iconmonstr is a free set of mono-colored and very simplistic yet beautiful icons.

The set includes 600+ items and it is possible to find multiple variations for almost each element.

Icons are mostly focused for web apps as most of them are actions, charts, badges or social networking-related.

They are available as PNG + SVG files and completely free to be used in free + commercial projects.

P.S. The only bad part is that the set is not offered as a single download pack but you have to browse pages to view/download each of them.

SeuratJS is a plugin for the powerful Raphaël that enables us to create vivid animations and pixelated artwork.

It extracts the color information from any given image and rebuilds it in SVG with the modifications applied.

The plugin works cross-browser and can be customized with various settings (like the shape of the brush being used to re-generate images).

NVD3.js is an open source charting library that is built on top of the impressive D3.js.

The library follows the practices an style of "how D3.js was built" which makes it comfortable for D3.js fans.

Charts generated are interactive and can be easily improved or customized.

Although it is in the early stages of its development, there are already multiple chart types including line, bubble, area and several combinations of them.

Meteocons is a set of free icons that is focused on a single subject: the weather.

The set contains 40+ items covering most of the weather conditions, new items are added time-by-time and it is offered in many formats:

• PSD, CHS, EPS, SVG
• desktop and web-font

This handy icon set is completely free for both personal and commercial projects.

JQVMap is a jQuery plugin for rendering vector maps by using SVG for modern browsers and VML for the rest.

It is a heavily modified version of another plugin, jVectorMap, and comes with ready-to-use maps of "world, USA, Europe and Germany".

There are several customization options for beautifying the maps including colors, borders or their opacities.

Maps can have zooming enabled or not, show tooltips of data when hovered and there is callback for clicks.

Also, it is possible to select any regions on initial load or after any custom event.

Icon fonts (pictograms) are great for having scalable and easy-to-style icons in web projects and they seem to be used more and more each day.

Fontello is a web-based and open source project that allows us to combine any selected items from multiple iconic fonts to create a custom + lighter font.

There are 3 built-in iconic fonts (Entypo, Iconic, Web Symbols). Within few steps (select any letters from the icons, re-arrange them), you get a new font.

The generated font is in SVG and web fonts can be produced from it using online generators like the one that FontSquirrel provides.

PICOL (Pictorial Communication Language) is a project to find a standard + reduced sign system for electronic communication and comes with a set of 500+ icons for that.

Items in the set are mono-colored and has 3 versions: 16*16px PNG, 32*32px PNG and SVG.

There are some badge icons inside the set (like accept, edit, delete) for adding an action message to icons.

Also, a web-based generator helps creating a custom icons in any size with the desired badge.

JSGL is a JavaScript graphics library for drawing and moving vector shapes with ease.

The library enables us to create and transform objects (using SVG/VML) dynamically.

There are built-in elements like line, circle, ellipse, polygon, etc. and support for stroking and/or filling them with many customization options.

Demos provided (PathFinder and NeuralNet) give us a strong opinion on the capabilities of the library.

Desktop users are experienced enough to know how they can interact with a website, use shortcuts and get the most out of the browser.

For touch-enabled interfaces, things are different. There is a new question: "which gestures are supported by the app/website?".

Cue is a free (public domain) gestural icon system that aims to build a standard visual language of touch-based interactions.

There are icons for actions like swipe, drap, touch, tap and hold, spread and more.

Each icon comes in a labeled and unlabeled version and the set is in .PNG, .SVG Omnigraffle Stencil and InDesign formats.

Web Symbols is a free font that includes many widely-used icons in websites and apps rather than letters.

It has icons for CMS interfaces, gallery navigation, social networks, social apps and various other items like a loader, e-mail or list.

The typeface comes in all the required formats including .woff, .ttf, .svg, and .eot.