Quorum Call Conference Software
Quorum is software which runs as a phone conference server on any Windows PC. Callers dial into the server to join telephone conferences. Callers can connect to a conference call using either standard or VoIP lines on external telephone numbers or through an office phone system. ... ~ Easily allocate new conference IDs on the phone. ... The conference creator then gives this number to each conference participant. ... Whenever any person dials the server and enters this conference number, they will join in the current conversation with the other members of the conference.
http://www.audiochannel.net/software/quorum.zip - 947Kb - Download - Screenshot

3CX VOIP Phone for Windows
Free VOIP / SIP phone. Use your PC as a phone. Works with any SIP / VOIP provider/ phone service. Use instead of the soft phone provided by your VOIP provider which locks you into their VOIP phone service. Easy to use interface includes dial pad and buttons to transfer or forward a call. ... Features include * Integrated phone book (allows you to assign caller ID to a name) * Supports several SIP profiles * Displays caller ID * Individual ring tones (per caller) * Drag & drop handling * Call log * Incoming calls: identify, accept, reject or ignore * Record phone calls * Multiple calls...
http://www.3cx.com/VOIP/3CXPhone.exe - 1Mb - Download - Screenshot

vPhonesoft
vPhone is a feature-rich VoIP Internet-Phone software. vPhone customers can download for FREE and talk to each other by voice or video calls, including multi-participant conference calls, send SMS, MMS messages from vPhone to vPhone and from vPhone to any e-mail, completely free! ... Additional features of vPhone allow our customers calling regular and cellular phones worldwide at great rates, sending SMS messages to cellular phones, a built-in answering machine with Web access, and all these exciting features: Voice call PC to PC, Voice call - PC to regular phones, Voice conference - 1+4...
http://www.virtualiphone.com/vPhoneSetup.php - 3b - Download - Screenshot

PC-Telephone
Make FREE pc-to-pc, pc-pc and cheap pc-to-phone, pc-phone, pc-to-fax, pc-fax, phone-to-pc, phone-pc, fax-to-pc, fax-pc calls over Internet/VoIP or ISDN/PSTN telephone networks. Use your computer as internet telephone, USB phone, USB handset, ISDN telephone, ISDN fax, answer phone, fax software,... Works with all Firewalls, NAT and LAN routers - nothing to configure.
http://www.pc-telephone.com/download/pc-telephone.exe - 1Mb - Download - Screenshot

ActiPOINT
ActiPOINT of COMIREL offers a comprehensive call management and contact management. It supports variously initiating of calls and reading all calls. ActiPOINT provides following telephony features: Third-Party-Conference, managing of 3 phones, line toggling, call redirection, call forwarding,... An incomig phone call trigger a Outlook journal popup... ... - ActiPOINTnotesD : Extends Lotus Notes by the possibilties of ActiPOINT to initiate a phone call. ... If an incomig/outgoing phone call take place then an email entry will be attachet...
http://www.comirel.de/en/templates/ProdCTIActiPOINTTrial.htm - 2Mb - Download - Screenshot

Gizmo Project
Gizmo Project is a free Internet phone for your computer that lets users make crystal-clear free calls using the Internet. As easy to use as instant messaging, calls offer crystal-clear voice quality and PC-to-PC calls are always free. Calls to ordinary landlines and mobile phones are available... Gizmo Project users enjoy high-end features as customizable, free voicemail which is conveniently sent to you via email, free conference calling, free call forwarding, complete call history, free access to millions of people on SIP-based networks, built-in instant messaging (IM) capabilities,...
http://www.gizmoproject.com/GizmoDownload/WinGizmoInstall.exe - 10Mb - Download - Screenshot

Bombino (2) 2005
Bombino is a small but powerful skype plugin for creating conferences on-demand via SMS. After being installed it acts as a server. It receives SMS-commands from a (remote) user, checks privileges and creates the requested conference. It can be used to call skype user from ordinary phone also. ... The maximal number of conference participants is 2 for this Bombino version.
http://www.icebrains-soft.com/bombino_2005_download - 2Mb - Download - Screenshot

Bombino (3) 2005
Bombino is a small but powerful skype plugin for creating conferences on-demand via SMS. After being installed it acts as a server. It receives SMS-commands from a (remote) user, checks privileges and creates the requested conference. It can be used to call skype user from ordinary phone also. ... The maximal number of conference participants is 3 for this Bombino version.
http://www.icebrains-soft.com/bombino_2005_download - 2Mb - Download - Screenshot

Bombino (4) 2005
Bombino is a small but powerful skype plugin for creating conferences on-demand via SMS. After being installed it acts as a server. It receives SMS-commands from a (remote) user, checks privileges and creates the requested conference. It can be used to call skype user from ordinary phone also. ... The maximal number of conference participants is 4 for this Bombino version.
http://www.icebrains-soft.com/bombino_2005_download - 2Mb - Download - Screenshot

sharpVoice(tm) Client
sharpVoice (formerly CyberTalkOnline) is a mature, reliable internet telephony program that enables free PC-to-PC and inexpensive PC-to-Telephone voice conference calls. sharpVoice Version 6. 0 offers great sound quality even over slow internet connections and the ability to conduct multi-person... Then you must register to make multi-person conference calls, PC-to-Phone calls, and to avoid advertising. ... Contains no SpyWare. ... Fully functional and ad-free for 30 days. ... Network-friendly design lets you make and receive calls even if you use a firewall or proxy server.
http://www.sharpvoice.com/download/sV6Setup.exe - 1Mb - Download - Screenshot