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
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
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
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
LightShot - The fastest way to take a customizable screenshot.