Telegram offers great apps for mobile communication. It is based on the MTProto protocol and has an Open API. I personally like Telegram for its speed and cloud-support (that makes a web app possible, unlike in the case of WA and others).
MTProto data can be carried over HTTP, but no official web-version for Telegram exists for the time being. So this project is my take at creating one.
Disclaimer:
This is an alpha version of the Telegram UNOFFICIAL web application. It may have undetected security issues, and there is definitely a load of bugs to fix, features to add and so on. So if you want 200% secure and fully functional communication, don’t use this yet! You can always find Telegram official mobile applications here: https://telegram.org
That said, I’m using this app myself and I’d like to share its sources, so anyone can contribute to the development. Any help is welcome!
Here are some screenshots of the interface:

The app is based on AngularJS JavaScript framework, written in pure JavaScript (migration to CoffeeScript is planned for the future). jQuery is used for DOM manipulations, and Bootstrap is the CSS-framework.
Project repository is based on angularjs-seed and includes a simple web-server, so it’s easy to launch the app locally on your desktop.
Install node.js and run node server.js. Open page http://localhost:8000/app/index.html in your browser.
It is possible to run this application in Chrome browser as a packaged app. In order to do this, open this URL in Chrome: chrome://extensions/, then tick “Developer mode” and press “Load unpacked extension…”. Select the downloaded app folder and Webogram application should appear in the list.
Also it’s necessary to replace following line in index.html:
<html lang="en" ng-app="myApp"><!-- ng-csp=""-->
with:
<html lang="en" ng-app="myApp" ng-csp="">
You can also download this application from Chrome Web Store: chrome.google.com/webstore/detail/telegram-unofficial/clhhggbfdinjmjhajaheehoeibfljjno. This is more secure way to use app than plain HTTP in web, because sources are downloaded only once and via HTTPS.
Besides frameworks mentioned above, other libraries are used for protocol and UI needs. Here is the short list:
Many thanks to all these libraries’ authors and contributors. Detailed list with descriptions and licenses is available here.
The source code is licensed under GPL v3. License is available here.
You can help this project by reporting problems, suggestions, or contributing to the code.
Go to our issue tracker and check if your problem/suggestion is already reported. If not, create a new issue with a descriptive title and detail your suggestion or steps to reproduce the problem.
If you know how to code, we welcome you to send fixes and new features, but in order to be efficient we ask you to follow the following procedure:
$ git clone git@github.com:yourname/webogram.git
$ git remote add upstream git@github.com:zhukov/webogram.git
$ git fetch upstream
$ git checkout -b improve-contacts-99
$ git add .
$ git commit -m "Improved contact list. Fix #99"
$ git push origin improve-contacts-99
Some times when you do a PR, you will be asked to correct some code. You can do it on your work branch and commit normally, PR will be automatically updated.
$ git commit -am "Ops, fixing typo"
Once everything is OK, you will be asked to merge all commit messages into one to keep history clean.
$ git rebase -i master
Edit the file and mark as fixup (f) all commits you want to merge with the first one:
pick 1c85e07 Improved contact list. Fix #99
f c595f79 Ops, fixing typo
Once rebased you can force a push to your fork branch and the PR will be automatically updated.
$ git push origin improve-contacts-99 --force
To keep your local master branch updated with upstream master, regularly do:
$ git fetch upstream
$ git checkout master
$ git pull --rebase upstream master
To update the branch you are coding in:
$ git checkout improve-contacts-99
$ git rebase master