1)   Loco4chat, funny sound clips for chat. 1.5
Play 150+ free funny sound clips during any chat & VoIP (Voice over IP), record your own funny voices and add more. 100% Free! Support: Live Messenger, Yahoo Messenger, Skype, AOL AIM, ICQ, QQ, GTalk, Xfire, TeamSpeak, Ventrilo, Camfrog & Paltak.
chat, add-on, addon, Messenger, Live Messenger, Yahoo Messenger, AOL AIM, ICQ, QQ, Goole Talk,

 2)   Embedded VOIP SIP Developers Kit 1.0
Embedded Windows CE VOIP Developers Kit is your embedded telephony solution for developing software/hardware to enable device to device phone calls using SIP/H323 phone right at the electronics level.
voip, voip sip, voip h323, instant messaging, embedded sip phone, embedded h323 phone, embedded voip, RTC API, embedded internet protocols, embedded telephony,

 3)   Telepati SIP Phone Freeware 1.5
Telepati SIP Phone Freeware allows you to make PC-PC phone-phone calls over the Internet. Developed using Research Labs VOIP SIP Phone SDK, this free soft phone brings SIP protocol support for ActiveX. Tested and works with 75% of the providers.
broadvoice, free ip call, free world dialup, iconnethere, ip-com, ipkall, lets ring, sipgate, sipphone, stanaphone,