calendarial.org
Calendar standards and open scheduling protocols are genuine technical work handled by open bodies, and calendaring standards in particular have active ongoing development. That’s the .org reading and it’s a real one.
Calendarial is a coined adjective on a word everyone knows, which is the right construction: the root carries the meaning and the invented ending makes it ownable.
Scheduling is among the most crowded software categories, with every descriptive name gone years ago. A coined word still saying “calendar” in its first five letters is a genuine find.
On the .org it suits an open project, a standards initiative, an interoperability effort, or a nonprofit scheduling tool.
Eleven letters, entirely phonetic, no double letters or silent characters, no hyphen. It survives being spelled out over a phone call.
The name is available. Enquiries welcome.