IBM ICU alternatives and similar libraries

Based on the "Internationalization" category.

utf8.h

5.4 4.4 IBM ICU VS utf8.h

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

2.1 2.7 IBM ICU VS tinygettext

A simple gettext replacement that works directly on .po files

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gettext

- IBM ICU VS gettext

GNU `gettext'. [GPL2]
libiconv

- IBM ICU VS libiconv

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