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ICU – International Components for Unicode
ICU-TC Home Page
2017-11-01: ICU 60 is now available.
It upgrades to Unicode 10 and CLDR 32, and ICU4J has been tested with Java 9. ICU 60 includes a new API for number formatting with a focus on usability, robustness, and performance. There are many more features and bug fixes. For details please see the ICU 60 download page.
What is ICU?
ICU is a mature, widely used set of C/C++ and Java libraries providing Unicode and Globalization support for software applications. ICU is widely portable and gives applications the same results on all platforms and between C/C++ and Java software.
ICU is released under a nonrestrictive open source license that is suitable for use with both commercial software and with other open source or free software.
Here are a few highlights of the services provided by ICU:
- Code Page Conversion: Convert text data to or from Unicode and nearly any other character set or encoding. ICU’s conversion tables are based on charset data collected by IBM over the course of many decades, and is the most complete available anywhere.
And much more. Refer to the ICU User Guide for details.
Unicode (and the parallel ISO 10646 standard) defines the character set necessary for efficiently processing text in any language and for maintaining text data integrity. In addition to global character coverage, the Unicode standard is unique among character set standards because it also defines data and algorithms for efficient and consistent text processing. This simplifies high-level processing and ensures that all conformant software produces the same results. The widespread adoption of Unicode over the last decade made text data truly portable and formed a cornerstone of the Internet.
Globalized software, based on Unicode, maximizes market reach and minimizes cost. Globalized software is built and installed once and yet handles text for and from users worldwide and accomodates their cultural conventions. It minimizes cost by eliminating per-language builds, installations, and maintenance updates.
The C and C++ languages and many operating system environments do not provide full support for Unicode and standards-compliant text handling services. Even though some platforms do provide good Unicode text handling services, portable application code can not make use of them. The ICU4C libraries fills in this gap. ICU4C provides an open, flexible, portable foundation for applications to use for their software globalization requirements. ICU4C closely tracks industry standards, including Unicode and CLDR (Common Locale Data Repository).
Java provides a very strong foundation for global programs, and IBM and the ICU team played a key role in providing globalization technology into Sun’s Java. But because of its long release schedule, Java cannot always keep up-to-date with evolving standards. The ICU team continues to extend Java’s Unicode and internationalization support, focusing on improving performance, keeping current with the Unicode standard, and providing richer APIs, while remaining as compatible as possible with the original Java text and internationalization API design.
New versions of ICU4JNI are no longer being created. If you need the functionality of ICU4JNI, you should consider migrating to ICU4J.
Who Uses ICU?
The following is a list of products, companies and organizations reported to be using ICU. If you have any feedback on this list (corrections, additions, or details), please contact us (on icu-support).
Companies and Organizations using ICU
ABAS Software, Adobe, Amazon (Kindle), Amdocs, Apache, Appian, Apple, Argonne National Laboratory, Avaya, BAE Systems Geospatial eXploitation Products, BEA, BluePhoenix Solutions, BMC Software, Boost, BroadJump, Business Objects, caris, CERN, CouchDB, Debian Linux, Dell, Eclipse, eBay, EMC Corporation, ESRI, Facebook (HHVM), Firebird RDBMS, FreeBSD, Gentoo Linux, Google, GroundWork Open Source, GTK+, Harman/Becker Automotive Systems GmbH, HP, Hyperion, IBM, Inktomi, Innodata Isogen, Informatica, Intel, Interlogics, IONA, IXOS, Jikes, Library of Congress, LibreOffice, Mathworks, Microsoft, Mozilla, Netezza, Node.js, Oracle (Solaris, Java), Lawson Software, Leica Geosystems GIS Mapping LLC, Mandrake Linux, OCLC, Progress Software, Python, QNX, Rogue Wave, SAP, SIL, SPSS, Software AG, SuSE, Sybase, Symantec, Teradata (NCR), ToolAware, Trend Micro, Virage, webMethods, Wine, WMS Gaming, XyEnterprise, Yahoo!, Vuo, and many others.
Harmony, Lucene search library, OpenOffice, PDFBox library, Solr search engine server, Tika metadata toolkits, Xalan XSLT, Xerces XML
Products from IBM
DB2, Lotus, Websphere, Tivoli, Rational, AIX, i/OS, z/OS
Ascential Software, Cloudant, Cognos, PSD Print Architecture, COBOL, Host Access Client, InfoPrint Manager, Informix GLS, Language Analysis Systems, Lotus Notes, Lotus Extended Search, Lotus Workplace, WebSphere Message Broker , NUMA-Q, OTI, OmniFind, Pervasive Computing WECMS, Rational Business Developer and Rational Application Developer, SS S Websphere Banking Solutions, Tivoli Presentation Services, Tivoli Identity Manager, WBI Adapter/ Connect/Modeler and Monitor/ Solution Technology Development/WBI-Financial TePI, Websphere Application Server/ Studio Workload Simulator/Transcoding Publisher, XML Parser.
Products from Google
Products from Apple
Products from Microsoft
Products from Harman/Becker
Products from Adobe
There are also some related projects that wrap the existing functionality of ICU.