Download of FlagSwitcher 2.3 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is Vladimir Kruchinin. The application lies within Productivity Tools, more precisely Office Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
FlagSwitcher is an application that shows which keyboard layout is on at the moment. A large flag image appears for a second when you switch the layout. Using side vision, you know the input language even when typing, without having to look at the screen.
You may want to check out more software for Mac, such as pdf-DocPro, PDFViewer or Instant PDF, which might be related to FlagSwitcher.