Sortd - Rated the #1 App for Gmail
MEAN - A Simple, Scalable and Easy starting point for full stack javascript web development
KanbanMail - A Kanban board for your emails.
Basecamp - A simple and elegant project management system.
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.
Blink - Blink is a team and employee app, with a Feed, Chat and Hub (for documents, links, files).