Carbon Fields - Carbon Fields makes it easy for you to create custom fields for post types, taxonomies,
DonorSnap - DonorSnap is a donor management and fundraising software.
Pods Framework - Plugin and framework for adding custom fields and custom content types to WordPress.
DonorPerfect - Nonprofits use DonorPerfect Fundraising Software for their Donor Management, Grant & Gift Tracking, Moves Management, Mass Mailing needs and more.
WPforms - Drag & drop WordPress form builder
NetSuite for Nonprofits - NetSuite for Nonprofits is a cloud-based donor management system for your nonprofit or social organization.