romcal

Romcal is an open-source JavaScript library that generates liturgical calendars for the Roman Rite of the Catholic Church, calculating feast days, seasons, and memorials for any given year. It is designed for developers building Catholic-focused applications, websites, or digital tools that need accurate, customizable liturgical data. The project is interesting because it automates a complex, rule-based calendar system, making rich liturgical information programmatically accessible for modern software.