Miranda-im is an extensible, light-weighted, faster, easier, personalize instant messenger supporting multiple protocols via extended plugin system to incorporate Skype, Netsend etc and an add-ons which help you to add some extra features such as skins, RSS, world clock, weather alert, safe messaging.
Miranda implicates the support for AIM, ICQ, Facebook, IRC, MSN, Yahoo, Gadu-Gadu, Jabber and many more.
This software supports all the inherent features that are available on any instant messenger nowadays.
Its attraction is in its plugins, there are over 120 open-source plugins available for Miranda which makes it truly versatile.
Moreover with the choice of hundreds of plugins, sounds, icons etc, Miranda Im gives you the flexibility to alter and customize the functionality according to your choice.