I'm building a base WordPress theme that will cater mainly to an events calendar plugin (yet to be decided.) I'm curious what WordPress users consider to be the best solution in terms of stability and usability?
I should note that recurring events are a must-have feature but that's just personal preference. This is a free GPL project that will be publically available as a basic greyscale starting point for other theme builders.
I'd like to know first though, which plugin do seasoned WordPress developers use?