In the previous post, I mentioned about Pidgin. And then now I am using another one, All-in-One Messenger. It is actually a Google Chrome extension, that allows you to use multiple instant messengers in the extension.
The nice part of the All-in-One Messenger is the HipChat. I was using standalone HipChat desktop app, it is resource hungry and very slow. Thus, this All-in-One Messenger really solves my problem by running various messengers.
Yet, the limitation is that I cannot disable an invididual messenger like Hangout or Skype. It can only choose to delete the messenger. I tried sign out, but it will automatically login whenever the All-in-One messenger starts again.
Pidgin, best ever all-in-one messenger. Best, because it has a lot of plugins. If you have multiple GMail accounts, such as personal GMail, and your workplace uses Google App, then you can just use Pidgin. Need not open so many applications.
If you need Skype, for messeging only or group chat, install skype4pidgin plugin. It is better to use it instead of running heavy Skype for Linux Alpha or very old version of Skype. Using outlook.com web version Skype cannot give any notification, but allows you to view the images directly. But still, using Google Talk/Hangout and Skype services together through Pidgin is much more convenient.
I tried with Telegram also. It works. There are various plugins available. If you need notifications from multiple chat services (including Facebook), Pidgin is the best!