Charitable - A WordPress donation plugin that gives you full control over your fundraising experience.
Cronofy - Unified Calendar API for developers
Revv Online Fundraising Platform - Revv is the fundraising platform that raises organizations more money.
ApPHP Calendar - ApPHP Calendar is a PHP calendar script that may be easily integrated and used with various PHP projects, such as schedulers, event, etc.
Give - A WordPress plugin for easily collecting donations
Calendarix - Calendarix is a powerful and easy to use web-based calendar that runs on PHP and MySQL.