AnyCase - AnyCase App is an multi-program direct in-place case converter for Windows.
GCC C Preprocessor (cpp) - Top (The C Preprocessor)
TitleCase - Convert text to Title Case, UPPERCASE, lowercase, CamelCase, Pascal Case, Start Case, snake_case, hyphen-case, ...
PP - A generic Preprocessor - P is a text preprocessor designed for Pandoc (and more generally Markdown and reStructuredText).
caseconverter.pro - The case converter that thinks ahead incl. JSON conversion
xmllint - command line XML tool