Zendesk vs Zammad: What are the differences?

Developers describe Zendesk as "The leading cloud-based customer service software solution". Zendesk provides an integrated on-demand helpdesk - customer support portal solution based on the latest Web 2.0 technologies and design philosophies. On the other hand, Zammad is detailed as "A web-based, open source user support/ticketing solution". It is a web based open source helpdesk/customer support system with many features to manage customer communication via several channels like telephone, facebook, twitter, chat and e-mails.

Zendesk and Zammad can be categorized as "Help Desk" tools.

Some of the features offered by Zendesk are:

• Offer your customers a quick path to the answers they need with knowledge base and community features.
• Zendesk takes customer communication from anywhere—your website, email, phone, Twitter, Facebook, and chat—and turns it into a ticket.
• Zendesk simplifies your support team's workflow with custom automatic actions, meaningful organization, and streamlined systems for managing support content.

On the other hand, Zammad provides the following key features:

• Web-based
• Open source
• Helpdesk/Customer support system

Zammad is an open source tool with 2.02K GitHub stars and 403 GitHub forks. Here's a link to Zammad's open source repository on GitHub.