Crisp Chat - Multi-channel customer support software
Zendo - Zendo allows you to sell productized, subscription and custom services. Collaborate and collect payments. Create quotes and invoices. Eliminate multiple tools and enjoy the simplicity.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Workvivo - Workvivo is the advanced-level employee engagement software that provides you with tools and options to engage the employees and team members in an effective way.
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
Nextcloud Hub - On-premises, enterprise collaboration solution for documents, emails, calendars and more.