Program: File Encoding Checker
License: Mozilla Public License 1.1 (MPL)
Description: File Encoding Checker is a GUI tool that allows you to validate the text encoding of one or more files. The tool can display the encoding for all selected files, or only the files that do not have the encodings you specify.
File Encoding Checker requires .NET 2 or above to run.
Website: http://encodingchecker.codeplex.com/
Useful if you use dropbox or similar cloud sync service to sync txt files between devices running on different platforms and end up with a confusing mess of different file encodings to tidy up with Notepad++