Leave application for student and teacher.
Is there any module where student or teacher can apply for leave and admin can grant the leave.
if exists please explain the process.
There isn't a leave application built into the core of Gibbon. We're working hard on many awesome changes in the codebase for the next few versions and placing more focus on long-term maintainability than new features for the time being.
It's all open source though, so if you have any interest in developing this as an additional module be sure to
check out the docs
and give a shout with any questions.