The actual developer of this free software for Mac is david-leonard.org. The software lies within Audio & Video Tools, more precisely General.
From the developer:
Once installed just drag this widget to the top left corner of your screen. Now you can drop new widgets and aligns them. When you're done just close it and everything will stay in place! This widget is still under development and it will be improved ASAP.
You may want to check out more software for Mac, such as The Keeper of Antiques: The Imaginary World Collector's Edition, which might be related to inGrid.