Downloading OneThingToday 1.0.8 for Mac from our website was free. The program is included in Business Tools. This software for Mac OS X was originally produced by linethirteen.
From the developer:
There are lots of ways to get things done. With OneThingToday you simply assign a single task or project to each day. This helps you focus on one major goal each day, avoiding the distraction of other pending tasks or ongoing projects.
Plan your time in Calendar mode, which gives you an overiew of one or several weeks.
You may want to check out more Mac applications, such as Onepoint Project, Open ERP or Teamwork, which might be related to OneThingToday.