FrontlineSMS 2.2.1

FrontlineSMS is award-winning free, open source software that turns a laptop and a mobile phone into a central communications hub. Once installed, the program enables users to send and receive text messages with groups of people through mobile phones. What you communicate is up to you, making FrontlineSMS useful in many different ways.
It does not require an Internet connection.
Attach a phone and SIM card, and pay your local operator per SMS as usual.
It stores all phone numbers and records all incoming and outgoing messages.
FrontlineSMS turns a laptop – or desktop – computer and a mobile phone or modem into a two-way group messaging hub. Since it works anywhere there’s a mobile signal, it doesn’t need the Internet, a major advantage for many grassroots NGOs. Once you have the software running on your computer, you can send messages to wide groups of people, and collect responses to any questions or surveys you might want to run, all via text message.
All data lives on your computer, not on servers controlled by someone else.
You can send messages to individuals or large groups, and reply individually – useful for fieldwork or during surveys.
It is easy to install and requires little or no training to use.
Developers can freely take the source code and add their own features.
It can be used anywhere in the world simply by switching the SIM card.