TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.

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.

Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...

TaskBoard - A Kanban-inspired app for keeping track of things that need to get done.

RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies

Pintask - Pintask is the most customizable Kanban board.