Capitan - AI powered shopping list: Never forget anything at the store
Sortd - Rated the #1 App for Gmail
GiftBuster - Wish list registry & shopping list app
KanbanMail - A Kanban board for your emails.
Bring - Clever shopping - simple and shared
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.