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5 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 ...
Z Z's user avatar
  • 2,525
5 votes
Accepted

free chat app with end-to-end encryption operating on Android and iPhone

Signal is another example of such app, which is commonly used. encrypts communication end-to-end it's free has Android and iPhone support group chats are supported etc. No web app (which Telegram ...
Destroy666's user avatar
  • 2,066
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 ...
William's user avatar
  • 535
4 votes
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Are there any instant messaging apps that support Markdown and LaTex?

I would suggest you telegram https://telegram.org/ with a LaTeX bot. You may start with an InLaTeX bot https://telegram.me/inlatexbot Once you added the bot, type @inlatexbot $$x^2$$ to the person ...
Yrogirg's user avatar
  • 156
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. ...
EyeEyeEye's user avatar
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 ...
agc's user avatar
  • 856
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, ...
Nicolas Raoul's user avatar
  • 19.5k
3 votes
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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 ...
Keegs's user avatar
  • 166
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 ...
Emaro's user avatar
  • 251
2 votes

Video chat for long distance, limited bandwidth users?

It might be worth taking a look at Cisco WebEx - which often doesn't show up in searches for Video Chat as it is an on-line meeting & conferencing solution which includes Video Conferencing. On ...
Steve Barnes's user avatar
  • 31.7k
2 votes

Presence on the network

I programmed a tool for you. It's called PC Presence and does exactly what you want. Unfortunately, I didn't have enough time to implement notifications yet, but on/off view already works. From the ...
palsch's user avatar
  • 203
2 votes
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Looking for chat source for web application (web socket/ajax)

I think ppmessage suite with your requirement. With PPMessage, you can chat with visitor or customer via Web or mobile App as open source Intercom alternative. And also, it has Web SDK. And this ...
Fajri Abdillah's user avatar
2 votes
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Subscribing a Gitter Chat / IRC channel to receive Notifications of all new questions of a Tag on Stack Overflow

StackOverflowGitterNotifier.jl Here you go, I made this specially for you. It posts in to the activity side bar on gitter. Note that depending on how you are syncing IRC and gitter this may mean it ...
Frames Catherine White's user avatar
2 votes

Software to teach my class from distance

Teamviewer is the software I've been favoring lately, so I'll add it to what the others said. Features: screen sharing audio and video sharig file transfer capabilites free for personal use cross-...
elder elder's user avatar
2 votes

Exchange text between web/desktop and devices

You could use PushBullet. You can share text, files, images and other data very easily between devices. PushBullet has apps for both Android and iPhone. There is a Chrome plugin if you use Chrome. ...
Aswin P J's user avatar
  • 945
2 votes

Open source self-hosted encrypted chat system

Use ChatSecure, run up your own XMPP server, OTR protocol. Downside here is that it does not meet your preferences: Is not available natively through web; OTR uses 128-bit long keys. Alterntaviely ...
DankyNanky's user avatar
  • 1,522
2 votes

LAN-only IP-to-IP video chat

I would recommend trying a WebRTC based solution. One of them is apprtc. You'll need internet connection to load the web page once, But after that you can talk to who ever you want on your local ...
Ishan Jain's user avatar
2 votes

Public chat for virtual coworking

Slack may be the most suitable, if it doesn't have the functionality that you need out the box, then they do have plenty of add-ons that may be worth looking at.
Scott's user avatar
  • 307
2 votes

Libre messenger program with loads of emoticons

I would suggest using an Emoji App + Riot, or any other FOSS chat app. PS: If you are so concerned about privacy I would switch to Linux. It is just as easy to use as windows, and it has a better ...
Jackson Mooring's user avatar
2 votes

Open-source Alternatives to MS Teams for Video Conferencing

BigBlueButton would meet your requirements: open-source: Yes. Does not require to own a server or domain (by me): While you can self-host it, there are providers offering it for you. Though BBB ...
Izzy's user avatar
  • 18.8k
2 votes

Alternative to Slack

Discord Features Discord is free and the most popular team communication app for gamers. The platform provides users with familiar Slack-like UI, Skype-like video, and voice chats. Discord is amazing ...
Pluviophile's user avatar
2 votes

Website chat platform that allows for third parties to communicate

Perhaps give Chatwoot a try? It's open-source and has an SMS intergration: https://www.chatwoot.com/features/sms-integration
Candide x Media's user avatar
2 votes

free chat app with end-to-end encryption operating on Android and iPhone

Whatsapp will do all of this and more. And it is free. Screenshot of website
Rohit Gupta's user avatar
  • 1,302
1 vote
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Looking for a messaging service with api that lets me fan out messages to multiple users at once

Telegram has a Bot API that does exactly what you seek. They have samples for all the possible programming languages, so it's totally not a problem. Going through your requirements: offers an api to ...
Suncatcher's user avatar
1 vote

Looking for a messaging service with api that lets me fan out messages to multiple users at once

Matrix works pretty well for this. Can be run decentralised with other matrix "homeservers". Its a protocol - and synapse is the "best" supported server at the moment. is basically based off bog ...
Journeyman Geek's user avatar
1 vote

LAN chat software between Linux and Windows

You could try pidgin with the bonjour protocol, it's not very modern but it should work. The following article shows how it works: http://www.ubuntubuzz.com/2011/11/use-pidgin-for-chatting-and.html (...
piec's user avatar
  • 111
1 vote
Accepted

Minimalist Facebook chat client for Android

Disa is my recommendation.It is a platform for unified messaging you can connect several IM into this open source program.Disa has everything that a traditional IM can offer. You can get it from ...
w͏̢in̡͢g͘̕ed̨p̢͟a͞n͏͏t̡͜͝he̸r̴'s user avatar
1 vote

Any moderated group chat software?

Have you tried JotCast? It's a moderated chat software. It sounds like what you're looking for, and they also have free accounts.
Carly's user avatar
  • 11
1 vote

Video chat for long distance, limited bandwidth users?

You can try my web application SignalRTC, it's completely web based video chat, using WebRTC and works on Chrome and FireFox. And it has hosted Andriod App.
Alexan's user avatar
  • 181

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