TextMeFree.com

Text For Free
TextForFree.net is an awesome site that lets you send ANONYMOUS text message for free to all your friend/enemies.

We just added a feature that lets you add a Text Message Box to your website/MySpace profile! Go to http://textforfree.net/tool.php Read more...

SMS Everywhere
Send text messages (SMS) to cell phones

There is NO LIMIT to how many messages you send once you register, apparently. Otherwise, you can send 2 messages Read more...

textyourbuddy
Text message any cell phone for free. No registration and we don't store your number.

TxtDrop.com SMS
Drop your friends a text in one easy step with free texting with txtDrop. Now comes with free two-way text messaging which means that TxtDrop "users and their message recipients [can] seamlessly carry on their conversations".

Now sent over 500,000 free texts in last two years! More blurb taken from their site: "txtDrop enables users in Read more...

MobiClient
Free SMS desktop application, that lets you send unlimited free SMS text messages to anyone in the United States

MobiClient FreeVersion: Send up to 3 free sms from pc to mobile per day to a single recipient Read more...

Mobile-Sender SMS
Mobile Sender provide free SMS services to the USA and around the world. Members can send unlimited amount of free messages.

Free members get delivery reports, message scheduling and more. Messages are sent through an SMS gateway rather than using SMTP technologies. Read more...

txt2day.com
Site for North American and Canada, but can also send free sms to some other countries around the world. Includes a useful tool to finding the service provider of a mobile phone number.

Free Text Messaging - www.txt2day.com. txt2day is one of the most popular free SMS text messaging site on the web. Read more...

TekstMe
TekstMe is a free online SMS service for the USA. Send unlimited free sms, add contact, and send group SMS.

USA only. There is also a paid service for Bulk SMS and added features. Read more...

Textinghome.com
Send and receive free text messages to and from US cell phones. No need to register to use the service. You can choose to have replies sent to your cell phone or to your email, all completely free.

Textinghome is determined to protect privacy when sending text messages online for free. Read more...

Thumbcare.com
Got Thumbitis? Free text messages from your PC! This site offers free texting service to help prevent thumbitis. Use your full keyboard to send text messages around the globe.

Sends texts mainly to North American but also includes other countries such as some networks in the UK, Africa, Poland, Read more...

Cherple
Free text messages to US cell phones for anyone with an internet connection anywhere in the world. With Cherple you have to download their software and install it on your computer (Windows and Mac version available). Then you can send a text message to US mobile phones inviting them to join the Cherple network. Once they have done that, you can send free sms to that cell phone, there will be a standard sms charge for the cell phone that sends an sms back to you but all sms you send will be free. You will receive sms replies to your Cherple software on your computer. You need to have an internet connection to send free sms.

The Cherple website comes with good installation and usability guide to help you get going. There is no registration required Read more...

Text Surprise
Free SMS service for Canada and the US. Site shows which US and Canadian carriers are supported.

Just added by site owner (Jan 2013):

"I am about to unroll a ton of updates I think your users will Read more...

TextEm
TextEm.net is a free text message service to cell phones in the United States, most cell phone carriers are supported, but not all. See the up-to-date list of supported carriers on the TextEm website. You need to know the cellular provider of the mobile number you're texting. Your IP address is logged when you text, and you can block your number if you receive spam.

If you log in and create a free account and if you include your email address in the SMS you Read more...

TextPort.com
TextPort.com is a free SMS service that supports both sending and receiving of text messages in the U.S. and Canda. Message delivery is immediate and there are no ads or links attached to messages that are sent. Registration is optional and free. You can send text messages internationally for a small charge, and when you register you get 10 free international text messages.

Registering exposes advanced features like real-time inbound message alerting, message logging, contact manager and message history. TextPort also offers texting Read more...

SendsmsNow
Send free sms to many countries including USA, Canada, India, Pakistan, Europe (not the UK), Figi, Kazakhstan, Vietnam, Kenya, Ethiopia and other African countries.

You don't have to register but if you do register you get additional free services such as: receive text replies Read more...

AnonTxt.com
Send Free Anonymous Text Messages Online

Anonymous text messaging. No information is collected or logged. Read more...

Fun Text Flirts
Free TWO WAY Text Message Flirting

Fun Text Flirts lets users send free text message flirts and receive replies to their email. Note: you must choose Read more...

FreeTextSend
FreeTextSend.com is a site where you can send free text messages to anyone in the US, with more countries to be added on shortly.

Email 2 sms service, I think, so that means that you need to know your friend's cellphone network provider. Ad-supported site Read more...

Google Voice
Currently only available in the US, Google Voice lets you send free sms. Text messages sent and received through your Google Voice number are completely free.

There is a mobile application for Android and Blackberry devices which lets you send sms directly from your cell phone Read more...