Peace and grace,
Currently, I do not think there is an open source resource for the Standard Sundays (Annual) Lectionary (or for that matter, any lectionary at all).
There are various links
that are available for one to see the readings of the church but I have not been able to come across any lectionary similar to the one on copticchurch.net or SUSCopts that provides the lectionary readings automatically based on the day (server side - php)
I was hoping I would shoot out a message to my fellow brothers and sisters who are talented in this area and may have the time and the technical ability to create something like this.
There is a cool electron app that I can include, that would be cool if we created something like it.
Don't really have much more to add. Was hoping that maybe someone would see this and decide to work on it.
Your brother in Christ