Habit List - Create good habits and break bad ones with the app that keeps you focused.
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Momentum - Agile goal and performance management
TeXstudio - TeXstudio is an integrated environment for writing LaTeX documents.
Streaks - The to-do list that helps you form good habits.
LyX - LyX is a document processor.