I'm using a number of different IM clients... but none is close to Skype in terms of reach, hangout probably being the closest one.
Do you have a preferred one?
I would say Hangout is about the best and easiest for us and with external global people we work with and seems closest to Skype in terms of features. We like the desktop sharing and integrates fairly well with both iOS and Androids, can SMS and the most powerful feature to me is to call a user on their phone and add in.
for video I've been using private <a href="http://www.blab.im" rel="nofollow">http://www.blab.im</a><p>for text mainly just Facebook messenger (sorry)