The tools are grouped into multiple functional areas. A selection criterion as listed below are set to include any tool in the stack.

Ease of Use
Support for Integration with other tools
REST API/ SDK/ CLI availability
Scalability and Compatibility
Selection of backend database
Authentication and Access Control
Support for SSO/ LDAP/ Integrated Login
Estimate license and other costs to meet budget needs
Web vs. Native client functionalities
Ease of Install and Admin
Hosted vs. in-house
Plug-N-Play model to replace a tool with a better enhanced functionality
Backup, Disaster Recovery (BDR) and High Availability (HA) functionality