MobiSMS for Outlook
Send 2-way SMS from Outlook. Receive replies in your Inbox or on your cell phone. Synchronize Calendar events and Tasks, create Inbox filters for instant SMS alerts, send bulk SMS with our advanced import module, create 'SMS Speak' with our unique SMS dictionary and add your own Sender ID to... Use our SMS Control Panel to set individual and group use, perform adds, moves and changes and retain a complete audit of all outgoing messages.
http://www.mobimarketing.com/downloads/mobisms.zip - 570Kb - Download - Screenshot

Oxygen SMS ActiveX Control
Oxygen SMS ActiveX Control allows you to send and receive text and picture messages, send CLI Logos, read and write default SMS centre number, get stored message total and busy count, their locations, read and delete from SMS inbox. You are able to get phones' IMEI, model, software and hardware... Registered version has no send and receive limitations. ... ASP, Microsoft Visual Basic, Microsoft Visual C++, Microsoft Access, Borland Delphi, Borland C++ Builder). ... This control is shareware. ... The control can be incorporated into any programming environment that supports ActiveX controls...
http://www.oxygensoftware.com/download/O2SMSv22.zip - 473Kb - Download - Screenshot

SMSList
Windows application to send and receive SMS from PC via GSM modem. SMS can be sent to single recipients or mailing lists. Simple usage thanks to an intuitive user interface. Features: send, receive, long sms, flash sms, status report, phone book management, incoming voice call forward, batch... Performances: max 20 sms/minute Suitable for mobile marketing, CRM applications, sales force support, automation (M2M, security, remote control, security systems, environmental monitoring, automotive applications).
http://eng.menhir-informatica.com/download/SMSList_Demo.zip - 3Mb - Download

MobiSMS
Sending an SMS is as easy as sending an email. Includes instant activation and FREE test credits. Use MobiSMS to receive appointment reminders from Outlook or Outlook Express, trigger alerts, SMS your customer lists, create Inbox filters and more. MobiSMS includes 2-way SMS gateway support. ... SMS replies are automatically routed to your e-mail Inbox and include a summary of your message and the reply.
http://www.mobimarketing.com/downloads/mobisms.zip - 590Kb - Download - Screenshot

Cell Messenger
Cell Messenger lets you send, receive and archive SMS messages from your mobile phone. It provides support for reading your mobile's phonebook, sending group messages, anti-spam SMS filtering, unicode and multipart SMS messages.
http://www.sw4me.com/CellMgr.zip - 2Mb - Download - Screenshot

PC SMS Bulk Sender
Very simple & powerful SMS marketing tools. It could be very useful to manage send/receive up to 10 thousand SMS / 24hours only using GSM phone/modem connected to PC, very useful for any purpose ultimately for SMS marketing, Invitation, Season greetings,etc. ... No internet connection or token required.
http://smsgee.satriyo.net/SMSg100.zip - 900Kb - Download - Screenshot

Oxygen SMS Gateway
Oxygen SMS Gateway allows uninterruptable communication between people regardless of the service used. Current version supports two services: SMS and e-mail. It means that people having at least one of these services can communicate with each other. The main advantage of Oxygen SMS Gateway over... Then you can receive the answer, reply to this answer and so on. ... The Oxygen SMS Gateway works under Microsoft Windows'95,'98, Windows NT, Windows ME and Windows 2000 operating systems family. ... You can send SMS to e-mail address and vice versa.
http://www.oxygensoftware.com/download/SMSGate10.zip - 1Mb - Download - Screenshot

Redcoal Mobile Messenger
Chat via SMS with Mobile Messenger! Just click the send SMS button created by this easy-to-install program and send and receive SMS messages to and from your field employees, staff, clients, partners and friends to and from over 130 countries. Easy to set-up plug-in is free for non-commercial use. ... Redcoal Plug in allows you to: * Display your SMS communication in the [Chat Window]; * Retrieve mobile phone numbers from your contact database; * Send SMS messages to MS Outlook contacts and distribution lists; * Schedule SMS messages to be sent at a certain date and time; * Send messages...
http://download.redcoal.com/smsplugin_setup.exe - 2Mb - Download - Screenshot

NexySMS
Have you ever though of how great it would be to type SMS with the easy computer keyboard you are used to instead of struggling with the tricky one on your mobile phone? How about sending SMS from your computer to mobile phones worldwide using your own phone number, not messing with all those... Send and receive SMS messages from all over the world as easy as you use your online instant messenger. ... just like if you had sent them from your cell phone and receive the real-time delivery notifications.
http://www.nexytools.com/download/NexySMS.exe - 2Mb - Download - Screenshot

SMS Server
SMS Gateway is a powerful, flexible application, that enables you to send/receive SMS messages to mobile devices with your computer. It has an easy to use user interface, and an excellent internal architecture. The application can use a GSM mobile phone attached to the PC with a phone-to-PC... ) Software developers: Software developers can integrate SMS messaging functionality into their applications very easily. ... The Message Server puts all received SMS in an incoming database table. ... You can read more about this new technology, that provides high performance and reliablity in the...
http://www.ozeki.hu/index.php?owpn=504 - 0b - Download - Screenshot