Apps similar to Pango include Graphite (SIL), which is free and open source. Other options are International Components for Unicode. Between them they cover Mac, Windows and Linux.
Graphite is a programmable Unicode-compliant smart-font technology and rendering system developed by SIL International as free software, distributed under the terms of the GNU Lesser General Public License and the Common Public License.
International Components for Unicode (ICU) is an open source project of mature C/C++ and Java libraries for Unicode support, software internationalization, and software globalization. ICU is widely portable to many operating systems and environments.
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