I often take photos at protests and Pride events (for example). These all get named automatically by my phone, so I want to rename them all systematically before uploading them to Wikimedia Commons.
This C# console app will take pairs of quoted find and replace arguments before renaming all files. An optional final parameter can provide a glob instead of the default IMG*.jpg. Thus usage is:
PhotoRenamer (find replace)n [filter]
Calling with no arguments will output usage details.