i found it today: web|SIM – Instant Messenger for Second Life
it´s from a german guy: SL Name Keane Koga
“You can register at a terminal inworld and get a free premium access for 31 days.
(freebie tarif from 1L$ per month)
With the registration you´ll get the web|SIM-HUD.
With this HUD you are able to send IMs from SL to his website.
The SL password is not needed for web|SIM !”