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Viber
Viber is an instant messaging and Voice over IP (VoIP) app for smartphones. In addition to instant messaging, users can exchange images, video and audio media messages. The client software is available for Apple iOS, Android, BlackBerry OS, Nokia Series 40, Symbian, Bada, Windows Phone, Mac OS, and Microsoft Windows. Viber works on both 3G/4G and Wi-Fi networks. It first requires installation on a phone in order to work on a desktop operating system environment.
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Google HangOut
Google Hangouts is a communication platform developed by Google which includes instant messaging, video chat, SMS and VOIP features. Google has also stated that Hangouts is designed to be "the future" of its telephony product, Google Voice, and integrated some of the capabilities of Google Voice into Hangouts. In current versions of Android, Hangouts is the default application for text messaging.
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Whatsapp
WhatsApp Messenger is a cross-platform instant messaging client for smartphones. It uses the Internet to send text messages, images, video, user location and audio media messages to other users using standard cellular mobile numbers.
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Open office
OpenOffice is an open-source office suite. It could be considered as a competitor of Microsoft Office. OpenOffice.org contained a word processor (Writer), a spreadsheet (Calc), a presentation application (Impress), a drawing application (Draw), a formula editor (Math), and a database management application (Base). OpenOffice.org was primarily developed for Linux, Microsoft Windows and Solaris, and later for OS X. It was distributed under the GNU Lesser General Public License version 3 (LGPL). OpenOffice.org's default file format was the OpenDocument Format (ODF). It could also read a wide variety of other file formats, with particular attention to those from Microsoft Office.
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Framadate
Framadate is an online service for planning an appointment or making a decision quickly and easily. No registration is required. Framadate is carried out by the Framasoft Corporation which is a non-formal education organization.