AJAX may be an overused buzzword, but it also has some incredibly cool uses within your websites. We’ve rounded up the best AJAX tools for your perusal – free feel to add more suggestions in the comments.

AJAX Activity Indicators – A large collection of animated GIFs for you to use as your AJAX application’s progress indicator.

AJAX For N00bs – Just as the site name implies, a site to help people just beginning to learn AJAX.

AJAX Mistakes – An editable list of common mistakes developers make when implementing AJAX, and suggestions on how to avoid them yourself.

AJAXFreaks.com – A collection of scripts, tutorials, forums and more.

AJAXload.info – If you can’t find the perfect AJAX load icon for your project, this site will help you generate one to meet your needs.

Backbase.com – An enterprise-level AJAX development platform with numerous pre-built widgets.

Clean AJAX – A Sourceforge project for a Javascript, Server Side, AJAX framework.

dhtmlsite.com – Tons of tutorials for AJAX developers of all skill levels.

Google AJAX API – The Google API will help you implement Google services on your web page while utilizing AJAX page loading.

Google Web Toolkit – A Google-produced tool to help you become less accident-prone when writing AJAX apps.

jQuery.com – A JavaScript library built to work with AJAX; super slick on their front page.

LoadInfo.net – Customizable AJAX loading animated GIFs that are free to use.

MiniAJAX.com – A large collection of downloadable AJAX scripts, most of which are configurable.

Prototypejs.org – A JavaScript framework that includes an AJAX library and aims to make app building easier.

Qooxdoo.org – An open source AJAX development framework with JavaScript development and a rich GUI.

Rialto – A cross-platform, corporate web applications driven framework.

SAJAX – A framework for calling PHP, Perl or Python from your pages without refreshing the browser.

script.acul.us – Works with Prototype, works heavily on AJAX in interfaces.

Sergiopereira.com AJAX Articles – A large collection of tutorials and code snippets to help you learn AJAX.

ThinWire.com – A Java tool to help you build AJAX apps with a GUI Desktop feel to them.

Yahoo User Interface Library – Yahoo’s attempt at helping you build AJAX driven apps.

Hyperlinks to some free libraries/tools for sending/receiving SMS with a PC are listed below. They are for reference only.

http://www.gnokii.org/

A free and open source library. You can use it to send/receive SMS using a PC through a mobile phone/GSM modem. You can also use it to update address book and calendar entires, handle logos, load ring tones, etc. A good-looking gtk2 GUI is available. A lot of Nokia phone models are supported. Although this library is targeted for Nokia phones, phones from other manufacturers may still work under this library. You have to check its website for the list of models supported.
http://www.pxh.de/fs/gsmlib/
Another free, open source library that works under a variety of OSs (e.g. FreeBSD, Linux, MS Windows). You can use it to send/read SMS messages with a PC through a mobile phone/GSM modem. You can also use it to manipulate the phonebooks in the mobile phone/SIM card, or to store/retrieve the contents in the SMS store of a GSM mobile phone. The list of GSM phone and GSM modem supported can be found on its website.
http://www.kannel.org/
A famous, powerful, open source, and free WAP and SMS gateway. You can use it to connect to an operator’s SMS center (SMSC), or using a GSM phone/modem as a virtual SMS center. Kannel can handle multiple GSM phones/modems. However, as Kannel is a complex software with lots of functions, it may be hard to use for beginners.
http://jsmsengine.sourceforge.net/
jSMSEngine is a free and open source library written in Java. With jSMSEngine, you can send and receive SMS messages easily with a mobile phone or GSM modem. As it is written in Java, you can use it in all operating systems that support Java, such as Linux, Microsoft Windows, etc. jSMSEngine supports both ASCII and PDU mode. The jSMSEngine package contains a standalone application jSMSServer. You can use it to send/receive SMS messages without writing your own code.
http://javasmslib.sourceforge.net/
This is the website for the Java SMS Library Project. To quote from the website, this project aims to provide “A multi purpose library that sends sms, images, ringtones and OTA provisioning over TCP/IP, modem or direct cable connection to a GSM phone.” The library is free and open source. However, the project is not under active development.