in reply to sms and/or text messaigng send modules ?
Are you looking to send a small number of messages for personal use, or are you looking to run a busness that sends thousands of messages per day?
If it is for personal use, then most service providers have a web gateway you can use which should be easy to script. You can also connect to the serial port of your phone and send SMS messages via well documented AT commands.
If it is for a bussness, then there are companies that specialies in bulk sending messages, and depending on how fast you want them delevered and how reliable they need to be you should pay between a half and one tenth of the usual rate charged to the public. These companies usualy have SOAP or REST APIs you can use.
In the middle are number of methods for bulk sending messages without paying for them, usualy via short lived companies who are loosing money on every costomer, but making up for it in volume. A lot of the SMS messages on CPAN work this way, and of obvous reasons they are not very reliable.