Mumble - Mumble is an open source, low-latency, high quality voice chat software primarily intended for use...
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Discord - Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
GSC - With GSC, you can pick from any of 14 worldwide datacenters to host your own free voice server.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.