Iconosquare - Schedule now. We'll post on Instagram for you later!
TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Later - Schedule and manage your Instagram posts
Twitterfall - Twitterfall is an excellent choice if you want something basic, free and without much branding.
Storyheap - Manage your SnapChat and Instagram stories.
Tweetdeckr - Tweetdeckr is an open source Tweetdeck replacement client.