CiviCRM is web-based software used by a diverse range of organisations, particularly not-for-profit organizations (nonprofits and civic sector organizations). CiviCRM offers a complete feature set out of the box and can integrate with your website. More information: https://civicrm.org/

CiviCase is a tool for tracking and managing sequences of interactions between people in your organisation and contacts in CiviCRM. It's similar to a case management system. In addition to tracking and managing your organisation's interactions with clients or constituents, CiviCase can also help you manage internal organisational interactions. More information: https://docs.civicrm.org/user/en/latest/case-management/what-is-civicase/

You can host CiviCRM with groups like https://ourpowerbase.net/.