Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Laser Squad Nemesis - Laser Squad Nemesis is a Turn-based Tactics, Single and Multiplayer video game developed by Codo Technologies and published by Got Game.
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.
X-COM - X-COM is a Science-Fiction, Turn-base Tactics, Strategy and Single-player video game series developed by Mythos Games and published by MicroPose.
Redmine - Flexible project management web application
Xenonauts - Xenonauts attracts greatly on the sci-fi universe of the original X-COM to make a very familiar turn based tactical adventure.