Conference

• Openness - the Jabber protocol is free (from licensing), open, public and, in addition, easy to understand; There are many implementations of servers and clients, as well as open source libraries.
• Extensibility - Using XML namespaces in XML, you can extend the Jabber protocol to perform the required tasks and to support the interaction between different systems. Common extensions are developed under the control of the Jabber Software Foundation.
• Decentralization - anyone can launch their own Jabber server, this will allow organizations and individuals to engage in any experiments with IM.
• Security - any Jabber server can be isolated from the public Jabber network, many of the server implementations use SSL when communicating between the client and the server, and many clients support encryption using PGP/GPG within the protocol.

• A universal IM client for various IM systems - despite the many Jabber clients for different platforms, they do not provide such capabilities to interact with various IM systems like Trillian or GAIM; The interaction between Jabber and other systems is carried out by gateways located on the server side.
• 100% problem solving with different systems - some Jabber servers provide the ability to interact with other IM systems through gateways that translate the Jabber protocol into the protocol of these systems; However, Jabber was not focused on providing interoperability with other IM systems, because only the interaction systems themselves depend on the IM systems themselves (what they do not seek, and even vice versa, an interpreter).
• A unified IM system developed by one company - the community in Jabber is not monolithic; On the contrary, there is a large set of public and private Jabber servers, open source projects, software development companies using the Jabber protocol.

Allows you to create a discussion (or, in other words, brainstorming) with just one mouse click and without registering. Access to this discussion will be available only to those to whom the author will send a link to it.

Messenger from Facebook, rather than on Facebook, though, and put in a separate application.
First looked that the reason for the launch of the messenger as a separate app due to too heavy weight application Facebook, which is bad for the phone (it's not a full-fledged computer, the application needs to be compact).

In fact, the reason is somewhat different. If social networks were mostly ribbon, becomes today the main chat connection with someone, a group of ...
And after the advent of bots, the popularity of the instant messengers has grown. Because there was a separate site app. But it is still linked to Facebook and all contacts in there.

And often times just need the link and the link is maximally free and fast, why not at least make a separate icon to go to Facebook on the tape to find out how to get into messenger. Just click another icon appeared and we were there.

Free messaging via the Internet.

In addition to basic messaging WhatsApp users can create groups, send each other unlimited messages, photos, audio and video files up to 2 Gb.
Photos and videos will be stored on your phone, so do not abuse.

Secure messenger from Wire Swiss.
Free, no ads, encrypted end-to-end (that is, encrypted me on the phone, and stands for you, nor on the server).
Good sound, video, and group chats.
Built-in YouTube, Vimeo clips, Spotify, SoundCloud tracks.
Group chats with up to 128 participants.

Perhaps the best program for free calls on the phone or computer, excellent sound.

More than 200 million users.
Just set on the phone, enter your number, he sends himself an SMS, and is activated. No usernames, your username is your phone number, it simplifies adding users.
the Program scans your address book and adds to the list of those who have Viber. So you know whom to call.

you can Call not only Viber, but also to regular phones. The cost of calls to mobile and landline phones it is possible to learn here. Just enter the country and obtain information. Website in English, the country entered in English.

Japanese messenger messaging, calls and video calls via the Internet.
you Can call and chat from your computer or smartphone.
Supported group chat.
in addition to calls, and there is a chat message, making LINE mobile social network.
There are paid features, games, photo editor other applications.
LINE App used by over 290 million people in 231 countries.

Odnoklassniki social network messenger.

It is not necessary to have an account at Odnoklassniki.

• Text chat,
• group chat,
• voice messages,
• sharing photos, music, videos,
• create channels.

Of course it is necessary to consider this once the most popular program.
in order to send a message to someone's ICQ address, you have to be and myself on ICQ. And most of our users choose the ICQ service.

in addition to text messaging, ICQ offers:

• Free SMS from ICQ to mobile phone
• Free calls from computer to computer (like Skype).

1. Free calls to all Skype subscribers,
2. Calls without registrations,
3. Free video calls between Skype subscribers,
4. Free instant messaging.

By the way, free of charge only with Skype on Skype. It's interesting, but what prevents it from being installed :)?
Calls from Skype to the phone will have to be paid, but much cheaper than with a regular phone.

What is needed for this?

Language

Skype versions

1. Windows
2. Mac OS X
3. Linux
4. Windows Mobile
5. WiFi phones
6. Cordless phones
7. Nokia N800/N810
8. Skype on 3

Calls without registration

1. Go to skype.com
2. click "Start a conversation" by scrolling down the page.
3. Enter your name,
4. click Continue
5. send a unique link to everyone you need to chat with.
6. Clicking on the link, other users will be able to join the conversation.

Bluetooth

Symbian smartphone

Windows Mobile: smartphone, PDA and PDA

Wi-Fi with active transmission Ruthless to the battery, and in Windows Mobile it discharges very quickly.

Skype in browser without installing additional software. If you use Skype on your computer, you quickly navigate to the online version.

Advantages

1. does not require installation, does not take system resources, when we do not use it,
2. if you already have an account, you will already have an address book here, in principle, it's like logging into the program,
3. it's convenient to use it from someone else's computer, even if the program is not installed on it.

Disadvantages

We install the software and forgot, it starts with the system, we just use it. And then you need to open the browser and go not a site, otherwise nobody will reach us and lose the meaning of Skype.

Voice and text messenger from VKontakte.

Allows you to make regular text messages, voice communication as well as group messages and create a channel.
Video channel can be watched by subscribers and leave feedback in a text chat while you are on the air.