Gizmo5 is described as '(formerly known as Gizmo Project ) is a Voice over Internet Protocol communications network and a proprietary freeware soft phone for that network. You can chat with Gizmo, MSN, AIM, Yahoo, and Jabber contacts and call any number or Gizmo contacts from your mobile phone' and is an app in the social & communications category. There are more than 10 alternatives to Gizmo5 for a variety of platforms, including Windows, Linux, Mac, Android and iPhone apps. The best Gizmo5 alternative is RetroShare, which is both free and Open Source. Other great apps like Gizmo5 are Linphone, Empathy, imo and Zoiper.
RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using OpenPGP to authenticate peers and .
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Imo is a free, simple,secure and faster international video call & instant messaging app.
Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.
QuteCom is a community of enthusiasts and developers, creating free software products related to communication over IP. The flagship product of the QuteCom project is a softphone which allows you to make free PC to PC video and voice calls, and to integrate all your IM contacts...
Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).
Virtual PBX enables small businesses to set up professional, hardware-free phone solutions with Auto Attendant, business SMS, call routing, enhanced voicemail, customizable greetings, faxes, scalable extensions, and an online portal for easy management.
Chatzy is a free private chat service which you can use to communicate with people you already know or people who visits your blog or website. With Chatzy you can create a chatroom and send out email invitations very quickly and easily. No registration is required.
Remote Administrator Control is designed for connection to a remote computer where you can work fully as if working on a local computer.
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