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FastAlerts - Web 2.0 Online Instant SMS/Email/Voice Alerting Tool
SEA SMS (Free SMS Worldwide, registration not required)
Text 4 Free (free worldwide text and picture messages, plus bulk messaging - No signups)
Coifu (Free web to SMS for US residents)
Zemble.com (Free text messaging and group text messaging to US & Canada)
Wadja free SMS (Mobile social network with free SMS worldwide)
SMS to RUSSIA (Free SMS to Russia and Ukraine)
Free Text Messaging Service(Sending SMS to 190+ countries worldwide)
Text for Free (Free text messages in 4 easy steps USA)
Web2msg.com (Free SMS to Australian carriers with no signup.)
TextForFree.org (Free worldwide text messaging with replies.)
TxtDrop.com Free Text Messaging (Free SMS to the US & Canada, auto carrier detection, no registration, a Mac OS X Widget and a Windows Vista Sidebar Gaget.)
Callwave Free global SMS Widget. Cross-platform compatibility.