Non-core apps, installed on request:
Tasks sorted into day, week, month, year and future logs, each with an owner and a staleness check.
Send or receive a file over the local network, guided by a short code.
Timers and stopwatches, grouped into lists, that can ring an alarm while another app is open.
A fullscreen, keyboard-driven text editor, for a physical keyboard.
A weekly class or work schedule, with a lesson and a note pinned to each slot.