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Skype
Make calls from your computer – free to other people on Skype, cheap to phones and mobiles across the world. And the sound quality is great, too – keep it running all day, and it’s like you’re in the same room as the person on the other end.
All in one instant messaging software that support VoIP, internet fax, RSS, video conferencing, and support Windows Live Messenger, Yahoo Messenger, AIM, and ICQ. VoIP features include free internet calls, low cost PC to phone, and phone to PC calls.
Create, edit, and backup phonebook entries using your PC and stop typing in information using the mobile phone`s keypad. Manage your PIN codes, transfer data from one SIM/USIM to another, backup and export/import all phonebook entries.
DialDictate lets you call in dictation and send via email. You, and other users, dial into a computer running DialDictate to record dictation. Recording, replay, editing and file management are controlled by pressing numbers on your telephone keypad.
Astice SMS-Sender is a peace of software which closes the gap between traditional texting with a handset and/or using a web interface for sending an SMS. You can send an SMS from almost any Windows application.
4PSA VoipNow Express is a free, fully functional Linux IP PBX software, limited to ten phone extensions, used for hosted VoIP PBX services or in-house IP softswitch. Easy upgrade to full featured multi-tenant Professional edition.