Dropbox is an easy to use freemium cloud storage solution. It has a client sync utility for multiple platforms.

Spotify is online music platform with music discovery and recommendation features.

Telegram is a free cloud-based instant messaging platform.

Buffer is a software application for the web and mobile, designed to manage accounts in social networks, by providing the means for a user to schedule posts.

Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

GitHub is a web-based Git or version control service.

RescueTime is a personal analytics service that shows you how you spend your time and provides tools to help you be more productive.