WeCom

WeCom is Tencent's enterprise communication tool, and its defining feature is the bridge to personal WeChat: employees can message customers on their personal WeChat from a company account.

For businesses in China that is a significant capability, because customer relationships largely live in WeChat and this is the compliant way to hold them at the company rather than on an individual employee's phone.

It also covers internal messaging, approvals and a customer contact management layer, though its internal collaboration features are lighter than dedicated platforms.