CiviCRM is made for nonprofits. It can be overkill for simple requirements, but you can turn off most of the clutter. There is a low-cost SaaS hosting for $10/m

CiviCRM is made for nonprofits. It can be overkill for simple requirements, but you can turn off most of the clutter. There is a low-cost SaaS hosting for $10/month (https://civicrm.org/spark https://civicrm.org/spark). Full disclosure: I am a dev & hosting provider.