This Free JavaScript Charting Library is easy to implement and provides numerous API options to tweak the look of the graphs & charts.

Support Graphs are:

• Line graphs
• Spark areas
• Area graphs
• Stacked area graphs
• Spark bars
• Bar graphs
• Horizontal bar graphs
• Spark lines

Grafico JavaScript Charting Library is released under MIT License that makes it an open source library.

Website: http://grafico.kilianvalkhof.com/

This Free JavaScript User Interface toolkit uses progressive rendering and can render 30k+ lists and tables most instantly.

Uki doesn’t want to be a Jack-of-all-trades. It only does layout but it does it well. You won’t find any ajax or data storage layer code here.

UKI is amazingly lighweight JavaScript library and its build is under 30k. UKI supports all major browsers.

Website: http://ukijs.org/

This Free Mailer Library integrates into any web app written in PHP 5, offering a flexible and elegant object-oriented approach to sending emails with a multitude of features.

Swift Mailer is made up of many classes. Each of these classes can be grouped into a general “component” group which describes the task it is designed to perform.

Some Features

• Send emails using SMTP, sendmail, postfix or a custom Transport implementation
• Support servers that require authentication and/or encryption
• Protect from header injection attacks
• Send MIME compliant HTML/multipart emails
• Use event-driven plugins to customize the library
• Handle large attachments with low memory use

Requirements: This Free PHP Mailer Library operates on servers running PHP 5.2 or higher.

Website: http://swiftmailer.org/

Download: http://swiftmailer.org/download

This is a free low level effects library for creating some simple, beautiful yet useful effects for your  sites. This free javascript library is not a complete framework as mootools but it could be the base for complex libraries.

Bytefx is available under MIT licensee which makes it an Open Source JavaScript Library.

Website: http://devpro.it/bytefx/

This Open Source Free Java Chart Library supports bar charts, pie charts, line charts, time series charts, scatter plots, histograms, simple Gantt charts, Pareto charts, bubble plots, dials, thermometers and more.

It’s a well document API and supports a wide range of chart types. It targets client side and server side applications and flexible & easy in design.

This Free Chart Library has support for many output types, including Swing components, image files (including PNG and JPEG), and vector graphics file formats (including PDF, EPS and SVG).

Website: http://www.jfree.org/jfreechart/

Samples: http://www.jfree.org/jfreechart/samples.html

Download: http://www.jfree.org/jfreechart/download.html

Flot is easy to use, it is also advanced enough to be suitable for Web 2.0 data mining/business intelligence purposes, which is its original application.

This Free Javascript Plotting Library is easy to install, just include the Javascript file after you’ve included jQuery.

You need to get a version of Excanvas (e.g. the one bundled  with Flot) which is canvas emulation on Internet Explorer and you need at least jQuery 1.2.6 (but at least jQuery 1.3.2 is recommended for interactive charts because of performance improvements in event handling).

The Free Plotting Library is open source and released under MIT License.

Website: http://code.google.com/p/flot/

This Free Toolkit for Creating Graphical User Interfaces was initially developed for and used by the GIMP, the GNU Image Manipulation Program. It is called the “The GIMP ToolKit” so that the origins of the project are remembered. Today it is more commonly known as GTK+ for short and is used by a large number of applications including the GNU project’s GNOME desktop.

Some Features

• Cross Platform
• Language Bindings
• Native look and feel
• Object orientated approach
• Internationalization
• Features pertaining to mobile and embedded platform requirements
• Bidirectional text support
• Comprehensive collection of core widgets

GTK+ is licensed under the GNU LGPL 2.1 allowing development of both free and proprietary software with GTK+ without any license fees or royalties.

Website: http://www.gtk.org/

Using PHP.JS may speed up development for PHP developers who are increasingly confronted with client-side technology. PHP.JS is nothing fancy like jQuery—we’re just offering PHP functions, with all of their original flaws and benefits for whomever needs them.

It also offers added functionality because JavaScript does not natively support higher-level functions. No server component required to use this Open Source Library.

Website: http://phpjs.org

XRegExp is fully compliant with the regular expression flavor specified in ECMA-262 Edition 3 (ES3), and has been tested with Internet Explorer 5.5–8, Firefox 2–3.5, Safari 3–4, Chrome 1–2, and Opera 9. XRegExp uses feature detection—no browser sniffing.

This Open Source JavaScript Library is release under MIT License that means you can use it freely in your personal and commercial projects.

Website: http://xregexp.com/

Even better, flare features a modular design that lets developers create customized visualization techniques without having to reinvent the wheel.

Flare is open-source software released under a BSD license, meaning it can be freely deployed and modified (and even sold for $$).

Click to View Sample Applications built with Open Source Actionscript Library for Data Visualization – Flare.

Website: http://flare.prefuse.org/

Demo: http://flare.prefuse.org/demo

Download: http://flare.prefuse.org/download