Vergleich der einzelnen Dienste
Dt. Microblogging Dienst: SMS, IM/Jabber, RSS, Webinterface
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RapidSMS is a free and open-source framework for dynamic data collection, logistics coordination and communication, leveraging basic short message service (SMS) mobile phone technology.
slingshotsms is a minimal SMS server which builds on the work of pygsm, an excellent Python library for dealing with AT-compatible modems.
The SMS Server Tools 3 is a SMS Gateway software which can send and receive short messages through GSM modems and mobile phones.