Here's one that really bugged me so maybe it helps you:
The free programmers editor SciTe is cross platform and feature rich. The configuration of it is - shall we say "programmer like" you just edit an enourmous amount of parameters in a configuration file. For a long time the distribution of SciTe I was using insisted that my danish characters were actually russian. Turns out Russian was on in SciTeGlobal.properties
If you're on Windows and just want whetever the default is for your current locale be sure to comment out the
code.page and
character.set
options.