gettext alternatives and similar libraries

Based on the "Internationalization" category.

utf8.h

5.8 1.3 gettext VS utf8.h

📚 single header utf8 string functions for C and C++
tinygettext

2.3 2.9 gettext VS tinygettext

A simple gettext replacement that works directly on .po files

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IBM ICU

- gettext VS IBM ICU

A set of C/C++ and Java libraries providing Unicode and Globalization support. [ICU]
libiconv

- gettext VS libiconv

An encoding conversion library between different character encodings. [GPL]