GrowBot Automator for Instagram - This bot can automatically follow all of someone's followers for you.
YouLikeHits - YouLikeHits is an online service that brings results within seconds.
InstaPy - Automation script for “farming” likes, comments and followers on Instagram
LikesPlanet - Get Facebook likes, Twitter Followers, YouTube Subscribers, Comments, and Shares.
Everliker - Smart and simple assistant for Instagram
Linkcollider - Link Collider is a web-based service that is designed to grow your online business, social media networks, and personal blogs.