Kannel which is an open source SMS and WAP gateway is something that you must look at.
If you want to support MMS, Mbuni provides an MMS module for Kannel.
SMSLib is a Java library which allows you to send/receive SMS messages via a compatible GSM modem or GSM phone. SMSLib also supports some bulk sms operators (for outbound messaging only). It is open source under Apache License.
playSMS is a flexible Web-based Mobile Portal System that it can be made to fit to various services such as an SMS gateway, personal messaging systems, corporate and group communication tools
- Clickatell (www.clickatell.com)
- Gnokii (www.gnokii.org)
- Kannel (www.kannel.org)
- SMS Server Tools (smstools.meinemullemaus.de)
- SMS Server Tools 3 (smstools3.kekekasvi.com)
Gnokii (http://www.gnokii.org/) is another open source solution written in C which is initially for Nokia phones.
There is also a free but not open source library from http://www.scampers.org/steve/sms/ which is also written in C#.
You can also use Microsoft SMS Sender (http://www.microsoft.com/globaldev/outreach/dnloads/smsSender.mspx) to send SMS.
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