Todoist - Todoist is a to-do list that helps you get organized, at work and in life.

Element.io - Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.

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.

Chatib - Chatib is an online chat room where you can meet and chat with new people, make them friends, or even data them online.

Remember The Milk - Remember The Milk is a task and time management application for mobile devices.

Chattusa - Chattusa is a social network website that provides a free chat service and lets you connect with people from the USA without any hassle.