Google App Engine - A powerful platform to build web and mobile apps that scale automatically.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

Dokku - Docker powered mini-Heroku in around 100 lines of Bash

UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system

Google Cloud Functions - A serverless platform for building event-based microservices.

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.