Sortd - Rated the #1 App for Gmail
Datree.io - GitOps policy engine
KanbanMail - A Kanban board for your emails.
GitLocalize - Localize your GitHub repository, continuously.
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.
Reporting Tool For Gitlab - Issues, time & cost centre analysis across repositories