API collection

my-cool-sms.com
=============
http://my-cool-sms.com/downloads/my-cool-api.pdf

txtlocal.co.uk
==========
Web SMS - Features/Benefits
http://www.txtlocal.co.uk/web-sms-benefits.php

Email to SMS - Guidelines
http://www.txtlocal.co.uk/email-to-sms-guidelines.php

SMS Gateway API for Programmers
http://www.txtlocal.co.uk/sms-gateway-demo.php

Send Outbound MMS - Technical
http://www.txtlocal.co.uk/mms-picture-messaging-technical.php


tm4b.com
=======
Different connectivity methods and features
http://tm4b.com/connectivity/
http://tm4b.com/sending-sms/features.php

SMS API
http://www.tm4bhelp.com/kb/v-73.php
Web 2 SMS
http://tm4b.com/sending-sms/web-to-sms.php
Email to SMS
http://tm4b.com/sending-sms/email-to-sms.php
SMS Server
http://tm4b.com/sending-sms/sms-api.php

clickatell.com
==========

http://www.clickatell.com/downloads/http/Clickatell_HTTP.pdf
http://www.clickatell.com/downloads/smpp/Clickatell_SMPP.pdf
http://www.clickatell.com/downloads/smtp/Clickatell_SMTP.pdf
http://www.clickatell.com/downloads/ftp/Clickatell_FTP.pdf
http://www.clickatell.com/downloads/xml/Clickatell_XML.pdf
http://www.clickatell.com/downloads/soap/Clickatell_SOAP.pdf
http://www.clickatell.com/downloads/com/Clickatell_COM.pdf

Ready scripts:
http://www.clickatell.com/developers/scripts.php


bulksms.co.uk
===========
Web to SMS
http://www.bulksms.co.uk/w/solutions.htm

Desktop to SMS
http://www.bulksms.co.uk/w/solutions_bulksms_text_messenger.htm

EAPI to SMS
http://www.bulksms.co.uk/w/solutions_http_to_sms.htm

Email to SMS
http://www.bulksms.co.uk/w/solutions_http_to_sms.htm

Why I like clickatell.com?

Coming soon...

Why I like tm4b.com?

Coming soon...

Why I like bulksmsm.co.uk?

Coming soon...

Why I like my-cool-sms.com?

Pretty new company with lot of features with 3 different level of service:
-free
-standard
-premium

Here is the feature list:
-Sender ID
-Unicode SMS Text Messages
-Real Time Delivery Reports
-Long SMS Text Messages (765 Characters)
-Address Book - Send SMS with just 2 clicks!
-Web 2.0 API

The web interface far from perfect since very simple, however the Web 2.0 API allow all of the features easily. Very friendly and responsive support helps to solve any problem.

Actually I prefer more sophisticated web GUI.