Thryv
SalesForce
The industry standard CRM tool can also be a very robust database
Easily manage things like contacts and relationships
Very customizable and complex
A lot of the work for building a simple Salesforce solution is cutting out unnecessary features and/or fields
A ton of documentation for developers and users can be found
Has non-profit pricing (10 users soft cap however)
Can integrate with other apps using Zapier (an If This Then That tool) to enable automation of certain processes
Some built in functionalities include: reports, duplicate merging, validation rules, email alerts, and much more
Easily import data with CSVs