SAP SuccessFactors is one of the big names in HCM. They're currently pushing the boundaries of the category itself, calling their product an HXM suite, for Human Experience Management.
SAP is trying to transform traditional human capital management into a more employee-oriented endeavor. Through their HXM, they are trying to put the worker's experience as the main focus of the way companies engage with their people. Their product helps HR managers deliver experiences that resonate with employees while shaping their strategy.
One thing to consider is that SAP, like many of the biggest companies doing HCM products, has been criticized for having a frustrating user experience. With their shift towards being an HXM, however, it looks like they're tackling that issue and moving in the right direction.
The SAP SuccessFactors HXM suite is organized in four categories, employee experience management, core HR & payroll, talent management, and HR analytics & workforce planning.
SAP has a breadth of integrations resources in their API business hub. You can connect to all sorts of tools following their detailed guide packages depending on what you need.
Pricing for SAP's HXM suite is only available upon request.
Most SAP implementations are made through one of their partners. Implementations at SAP are also made easier thanks to their rapid-deployment solutions (RDP). These are packages with best practices for implementing the tool, each with tested configurations, presentations, test scripts, and offline demos.
Aside from having a Customer Success department and a vast partner ecosystem for implementations, SAP also has a resource center with documents, videos, and FAQs. There's also an academy-like site called openSAP.