Best iPhone Apps to Collaborate With Team Members

Freemium

Trello is a web based project management solution.

Commercial

Redbooth (Teambox) is a web-based and on-premises workplace collaboration tool and communication platform.

Find apps to do interesting things:

Download videos from internet in 4K.

Create product diagrams

Search on the internet for sites and resources.

Synchronize files between two directories.

recognize music by providing a music file.

Plays MP3 audio files