Thunderpad 0.9 for Mac is available as a free download on our application library. The program relates to Productivity Tools. The actual developer of this free Mac application is Alex Spataru.
From the developer:
Thunderpad is a simple, general-purpose and cross-platform text editor written in C using the Qt libraries.
You may want to check out more Mac applications, such as 3dissue, MacAppStuff Notes or Blurb Tally, which might be similar to Thunderpad.