Anveo.com : SMS to SIP, SIP to SMS (using SIP SIMPLE (MESSAGE)), SMS to email, sms to http [get], SMS web ui
Vitelity.com : SMS to SIP, SIP to SMS (using SIP SIMPLE (MESSAGE)), SMS to email, SMS web ui
voip.MS : SMS to email, SMS web ui
sms to xmpp, xmpp to sms — using ‘randomized’ resources
.
there are several VSPs with functional beta systems who wish to remain nameless
Himself being Sagacious