Trello is a web-based project management application with a beautiful card-based UI.
SlimPlanner keeps track of all the activities, tasks and appointments in one beautifully simple place. Scheduler, calendar or to-do-list...you decide. Keep it simple, let your teamwork flow.
MeisterTask is a beautifully designed online task manager that offers apps for Mac, Windows, iOS and Android. With customizable project boards and smart automations you work more consistently and efficiently than ever before.