How can CRM nonprofit software help with structured donor and volunteer management?

[Krayin CRM]

We're in the process of improving our internal systems for managing donor records, volunteer coordination, and communication logs. We're specifically evaluating nonprofit CRM software that can offer detailed segmentation, reporting, and secure access controls.

We've heard about open-source options like Krayin CRM, which offer custom modules and flexibility. Has anyone implemented a similar CRM for nonprofit workflows? We'd love insights on how well it supports integrations (email, SMS, payment gateways), and how easy it is to configure for small teams.
Any feedback or shared experiences would be valuable.