Asana is the 800-pound gorilla of task management for teams, dwarfing other popular services like the capable Trello. Asana is all about workflows and checkbox tasks that can be assigned to individuals. The Android app lets you take your tasks on the go and offline, syncing your progress when you're back on the network. It's a powerful tool with an excellent interface, and new features are added regularly. New Droid Apps

There are lots of ways to pay for things with your phone. But Venmo has a smart mixture of clean design, ease of use, and social functions that give it an edge. It doesn't do much, but it does let you easily send and receive payments from friends. And unlike other payment systems, it has momentum. It's usually the app people ask about when the group is splitting up the check.
File browsing is something everyone inevitably has (or wants) to do, so you might as well do it with a capable, fantastic file browser. Solid Explorer is pretty much as good as it gets in the file explorer apps realm. It features Material Design, archiving support, support for the most popular cloud services, and even some more power user stuff like FTP, SFPT, WebDav, and SMB/CIFS support. It looks great, it’s incredibly stable, and it just works well. There is a 14-day free trial with a $2.99 price tag at the end of it. This is, by far, the best file manager on Android for most people. Droid App