TweetDeck - TweetDeck is your personal browser for staying in touch with what’s happening now.
Instagram Automatic Posting by Iconosquare - Schedule now. We'll post on Instagram for you later!
Twitterfall - Twitterfall is an excellent choice if you want something basic, free and without much branding.
Grum - Post on Instagram from your computer!
Fenice - Read writing from Fenice for Windows on Medium. Fenice (fka Project Blue Dog) is a full-featured Twitter app for Windows designed to offer the best Twitter experience to every user (pro or casual ones).
Instaplus - Instaplus is an Instagram automation solution that utomatically likes, comments, follows, and unfollows the target audience.