Skype

Skype

Web site: www.skype.com
Category: Network
Subcategory: Instant Messengers, VoIP Clients
Platform: Android, HoloLens, iOS, Linux, OS X, Windows, Xbox One
License: Freemium
Interface: GUI
Programing language: C++
First release: August 29, 2003

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Skype – an application which lets users to make voice or video calls and keep in touch via an instant message system. It is available for many devices and operating systems such as smartphones, tablets, PCs, Macs and Linux.

The main features of Skype are:
– Video calls – don’t just hear the cheers, see it. Get together your friends and family on a video call. Watch your everyone’s smiles and cries when you tell them “We’re engaged!”
– Chat – reach people instantly. Send messages to your friends, liven up conversations with emoticons and Mojis, or create a group chat to make weekend plans with up to 300 people.
– Share – share your screen, photos, videos, documents, and files with your family and friends. Unlike email, Skype will transfer up to 300MB per file.
– Voice calls – make voice calls to anyone on Skype. You can also call mobile and landlines at low rates.

Skype uses a proprietary Internet telephony (VoIP) network called the Skype protocol. The protocol has not been made publicly available by Skype, and official applications using the protocol are closed-source. Starting from 2014, Skype uses a new protocol Microsoft Notification Protocol 24.

Skype was founded in 2003 by Niklas Zennström, from Sweden, and Janus Friis, from Denmark and the software was created by Estonians Ahti Heinla, Priit Kasesalu, and Jaan Tallinn.

CoyIM

CoyIM

Web site: coy.im
Category: Network
Subcategory: Instant Messengers
Platform: Linux, OS X, Windows
License: GPL
Interface: GUI, CLI
Programing language: Go
First release: December 10, 2015

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CoyIM – a standalone chat client that focuses on safety and security. It is a self-contained program that runs on Windows, Linux and macOS. CoyIM only supports one chat protocol – XMPP (Jabber). It is built upon xmpp-client and coyim otr3, and adds a graphical user interface and implies safe and secure options by default.

The developers ambition is that it should be possible for even the most high-risk people on the planet to safely use CoyIM, without having to make any configuration changes. To do this, CoyIM has OTR enabled and uses Tor by default. Besides that, it will only use the Tor Onion Service for a known server and also uses TLS and TLS certificates to verify the connection – no configuration required. The implementation is written in the Go language, to avoid many common types of vulnerabilities that come from using unsafe languages.

Main features:
– Support of the latest version of OTR.
– Detection of Tor (if installed) and connection through it.
– Use of Tor Onion Service if it is known by the server in question.
– Use of separate Tor circuits for each account in order to make it harder to tie accounts together.
– Insertion of random delays before connecting to each account in order to make fingerprinting of connections between accounts harder.
– SRV lookup for the server over Tor if available.
– Import of account settings, OTR settings, fingerprints, and private keys from other clients like Pidgin, Adium, Gajim or xmpp-client.
– Saving of all your configuration, including OTR fingerprints and keys, in an encrypted configuration file.