A CiviCRM extension to enhance functionality for fundraising and other campaigns in CiviCRM. Read the documentation here.
Warning
Campaign Manager seems to have an incompatibility regarding the display of expenses with CiviCRM Core 5.39 and up. The result is that no expenses are being displayed. There is a PR to CiviCRM Core to fix this, which is likely to be included in CiviCRM Core 5.67.