Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Sortd - Rated the #1 App for Gmail
KanbanMail - A Kanban board for your emails.
Taskade - Make lists, organize your thoughts, and be inspired to get things done. Taskade is a collaborative space for your tasks.
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.
ActionDesk - Build powerful automations with just your spreadsheet skills