Telephone dialer for Windows computers with a voice modem and headset.
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003,

VoiceCall is an answering system and telephone dialer with Caller ID support.
License: Shareware
OS Support: Win95,Win98,WinME,WinXP,Windows2000,

Record telephone conversations directly to your hard disk.
License: Shareware
OS Support: WinNT 4.x,WinXP,Windows2000,Windows2003,Win Vista

Just one click to make and send a Picture with MMS.
License: Shareware
OS Support: Symbian,

Block unwanted phone calls by caller id, with professional log.
License: Shareware
OS Support: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,

VoIPerized enables you to make free audio calls to other people.
License: Freeware
OS Support: Win95,Win98,WinME,Windows2000,WinXP,Windows2003,

Watchtone = Video+Ringtone Create and watch video on incoming calls.
License: Commercial
OS Support: WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003,Symbian,Handheld/Mobile Other,

Make calls via Internet in the US and other countries.
License: Freeware
OS Support: Win95,Win98,WinME,Windows2000,WinXP,

ZOIPER 20 Free Edition is IAX / IAX2 and SIP phone, compatible with Asterisk.
License: Freeware
OS Support: Windows2000,WinXP,Linux,Linux Gnome,Mac OS X,Mac OS X 10.4,Mac OS X 10.5,Win Vista

The best call screeer application for your BlackBerry handheld device.
License: Shareware
OS Support: RIM,