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16 votes
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Send messages between Windows computers over network

LAN Messenger is free (actually open source) and will do everything you need. There is a Windows build of it (as well as builds for Mac and a few popular flavours of Linux) which runs just fine on ...
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  • 1,543
9 votes
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Team chat with native Android/iOS apps, all open source (alternative to Slack)

Here is a software recommendation for you as per the features mentioned by you. You can review the same and let me know if you have any query. I have not used it but hope so that all the features ...
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8 votes

Cross-platform messaging for Android and iPhone

Google Allo nimbuzz is a proprietary cross-platform instant messaging aggregator for smartphones, tablets and personal computers is available for Android, iOS, BlackBerry OS, Symbian, Windows Phone ...
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7 votes

Cross-platform messaging for Android and iPhone

Google Hangouts works well for this. It was formerly known as Google Talk but the iOS and Android apps are now "Google Hangouts". It actually supports voice and video, but I haven't used those ...
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6 votes

Skype client alternative for Ubuntu

Okay, the only way I found to do it is to install the plugin for Pidgin. Unfortunately you still need to run the official Skype client in the background as the plugin interfaces with it somehow. But ...
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  • 226
5 votes
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Live chat software for sales driven website

Everything you are looking for is available with our product http://www.ChatNox.com We could talk further if you can come on our website for a chat and discuss. You can also write to me nicole at ...
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4 votes
Accepted

Skype alternative for Linux with counterpart for Android

Linphone here springs to mind: https://www.linphone.org/ I've not used this for many years, but I'm aware it has an Android app (and works with Windows, iOS and Mac). It's released under the GPL so ...
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  • 1,606
4 votes

Cross-platform LAN messenger that can run on multiple user accounts of the same machine at once?

Softros LAN messenger supports both the Windows and Mac OS X platforms. Pros: An Internet connection is not required. A dedicated server or server-client is not required. It supports Terminal ...
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4 votes

Skype client alternative for Ubuntu

A few years ago I would recommend Google Talk with my heart, but ever since Hangouts was release, I can't say that anymore, since many features are gone, namely the busy/away states. I would ...
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  • 141
4 votes

XMPP or LAN messenger where pasted images are directly shown to recipient

As of (almost) October 2015, it seems that there are several options available to you. For the best experience involving XMPP, you will need both client and server components that support XEP-0363. ...
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  • 625
4 votes
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VNC server for Android

I have been using something called Alpha VNC Lite. Alpha VNC lite doesn't seem to work on the home screen but most other apps seem to work fine. The device doesn't need to be rooted but you do not ...
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  • 517
4 votes

Alternative to Slack

Mattermost is the main alternative to Slack that covers most of your requirements. I have not looked at it in a while, but you will also find a few useful others here in previous questions: Team chat ...
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  • 1,990
3 votes

Mac chat client for Facebook

Have you tried Flamingo? I think it's close to what you've listed: it's a native app it's integrated with OSX's notifications it supports Hangouts too Unfortunately it does not support syncing ...
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3 votes

Online IM secure chat - one time chatter

I am using TextSecure for encrypted chat. You can add friends by phone number, but the phone number is only used as an identifier, all data actually goes through WiFi/data. Your messages are not ...
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  • 18.8k
3 votes

Program to set up an auto-responder for Google Hangouts

I made gchat.simon.codes to do this. It's a hosted service, but you could also run the bot yourself if you want (it's open source). Note that it's intended for accounts that you never log into, but ...
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3 votes

Skype alternative for Linux with counterpart for Android

Another reason to switch away from Skype is that they are owned by Microsoft and have been shown by the Snowden leaks simply to give data from Skype conversations to the NSA, including recorded calls. ...
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3 votes

Locally hosted website live chat

Try Microsoft Lync. Lync Basic 2013 gives you instant messaging (IM), audio and video calls, Lync Meetings, availability (presence) information, and sharing capabilities.
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  • 233
3 votes

Locally hosted website live chat

We here at Click4Assistance typically host the software on our own servers, however we do have customers hosting the software on their servers. Our script is a small piece of html / JavaScript and is ...
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3 votes

Email, Yahoo messenger, Skype in one app?

Try Digsby. It supports Yahoo, Email and multi protocols.
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3 votes

Email, Yahoo messenger, Skype in one app?

Pidgin can do most IM networks such as Yahoo, and Skype text chat with a plugin (but you need Skype installed also :( ). It doesn't do email, but it can notify you when new mail arrives for certain ...
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3 votes

Free portable instant messaging & audio/video calls for Windows, web, Android and J2ME

If you can do without emoticons, Linphone would be worth a look: Linphone on Android (source: Google Play; click images for larger variants) I'm using this on Android and am quite satisfied – ...
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  • 18.5k
3 votes
Accepted

XMPP or LAN messenger where pasted images are directly shown to recipient

IP Messenger is a LAN based messenger that allows instant sharing of text and images. Check it out at http://ipmsg.org/
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  • 146
3 votes
Accepted

How to facilitate chatting in a Drupal site?

Live chatting with anonymous users Have a look at the My Live Chat module. Some details about it (from its project page): This module adds the necessary script to the footer of ones site for ...
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3 votes

Video/audio chat programs that offer end-to-end encryption that do not let the service know of the content?

tox: Tox began a few years ago, in the wake of Edward Snowden's leaks regarding NSA spying activity. The idea was to create an instant messaging protocol that ran without any kind of central ...
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  • 840
3 votes

Alternative to Whatsapp that takes less phone storage space

WhatsApp can actually be configured to use much less phone space: Go to the settings Touch "Data and storage usage" Find the "Media auto-download" section In each of the items in that section, ...
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  • 18.8k
3 votes
Accepted

simple lightweight reliable method to send notifications to ubuntu over internet

My suggestion would be to use a chat app such as Empathy or even Discord. Both will send GNOME pop-up notifications and are trivial to install. Otherwise you could always make an email for just this ...
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  • 66
2 votes
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PHP live support chat software

Found one that matches all but one requirement* PHP - Live Chat (One time purchase: $22, Lifetime Updates) Features: Standalone Less than $50 Ajax Support Has chat box for users to start chat Can ...
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  • 7,554
2 votes

1:1 Video Chat that doesn't require logins

Jitsi Meet is open source, does not require any account and you can self-host it if you want. It works in the browser, so no installation needed. Jitsi Meet - Secure, Simple and Scalable Video ...
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  • 241
2 votes

Android chat / messenger supporting Bonjour / Avahi / Zeroconf / People Nearby

Found one! ChatSecure supports "People Nearby" though it doesn't say so on GooglePlay, I found out only after installing it and trying it. And it has a lot of pluses: Also supports XMPP, the other ...
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  • 121
2 votes

Alternative messaging network to WhatsApp?

Take a look at Kontalk. (Community-driven messaging ; A new way of communicating) Information: Kontalk is a secure instant messenger, allowing you to send and receive text, image and voice ...
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