What's a good Android app for keeping track of deadlines and project milestones, especially when collaborating with research assistants?

As someone juggling research projects and student collaborations, I've found the 'Day Counter' app to be surprisingly useful. The algorithm is surprisingly elegant in its simplicity. It's not a full-fledged project management suite, but its strength lies in its focus: counting days to or from specific events. This is helpful for managing citations, tracking grant deadlines, or even just marking the end of a semester. The cross-platform compatibility is also a plus, allowing me to check progress on my phone or tablet. While it might not replace more robust tools, it's an intellectually satisfying, pedagogically sound, and well-researched design for basic time tracking. It's a novel approach to an old problem, focusing on clarity and ease of use, which I appreciate.