FullCalendar.io is a comprehensive JavaScript library for creating interactive and customizable calendars with advanced scheduling features. It offers an extensive API and a variety of plugins to easily integrate with different frameworks and platforms.
Power.io is a platform that provides pre-built widgets and plugins for websites using various popular Content Management System (CMS) platforms. Its widgets are customizable with basic design and functionality features and can be easily added to a website's pages with a simple embed code.