Lutheran Lectionary Library
This library is the new backend for the upcoming Sanctus.org 2.0. It's a standardized library written for PHP 5 that can calculate the given Sunday of the Church Year using a variety of calculators following different Lutheran lectionaries. The code is hosted on Google Code and is openly available to anyone interested in the source code. I work on this project in my spare time as it's available, if you want to contribute to this project please contact me.
Google Code Project Page for the Lutheran Lectionary Library.