Get My Receipts by cloudHQ - Organize your receipts in one click
Sortd - Rated the #1 App for Gmail
KanbanMail - A Kanban board for your emails.
gfeed - Turn your Gmail into a social feed to read through faster
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.
FileFern - Never search for file attachments again