Which libraries have been ported to different programming languages?

Question

Since I am working with different Platforms and programming languages, I found there are many good libraries that are ported with different programming language than its original. For example JUnit and Log4j which has been ported into several different languages. Sometimes if I am already used to working with these libraries, I would find the ported version for it if I'm working with another programming language.

What are other libraries that you have found been ported to different languages and as good as the original?

Please make it one library per answer so others can vote.

Format:

Original-Library-Name, Original-Programming-Language

• Ported-Library-Name, Ported-Programming-Language

If possible with the links to the website of the libraries.

Answer 1

Spring Framework, Java

• Spring.Net, .Net
• SpringPython, Python

Answer 2

iText, Java

• iTextSharp, C#

Answer 3

SUnit, Smalltalk

• every other unit testing framework, pretty much every programming language
• unittest, python

Answer 4

JUnit, Java

• test/unit, Ruby
• NUnit, .NET
• PHPUnit, PHP
• unittest, python
• CppUnit, C++

Answer 5

Hibernate, Java

• NHibernate, .NET

Answer 6

AspectJ, Java

• AspectC++, C++
• AspectR, Ruby

Answer 7

QuickCheck, Haskell

• Quviq QuickCheck, Erlang
• RushCheck, Ruby
• ScalaCheck, Scala
• ClickCheck, CommonLisp
• PeckCheck, Python
• qc, Python
• QCheck/SML, Standard ML
• Scheme-Check, Scheme
• Test::LectroTest, Perl
• Reductio, Java
• QuickCheck, Java
• FsCheck, F#

Answer 8

FIT (Framework for Integrated Test)

• FIT.NET, C#
• PyFIT, Python
• RubyFIT, Ruby
• CeeFIT, C++

The ports are listed on the FIT wiki; there are also entries for Smalltalk, Perl, and Delphi, but I'm not sure about the state of the ports for those languages.

Answer 9

Lucene, Java

• CLucene - Lucene implementation in C++
• Lucene.Net - Lucene implementation in .NET
• Lucene4c - Lucene implementation in C
• LuceneKit - Lucene implementation in Objective-C (Cocoa/GNUstep support)
• Lupy - Lucene implementation in Python (RETIRED)
• NLucene - another Lucene implementation in .NET (out of date)
• Zend Search - Lucene implementation in the Zend Framework for PHP 5
• Plucene - Lucene implementation in Perl
• KinoSearch - a new Lucene implementation in Perl
• PyLucene - GCJ-compiled version of Java Lucene integrated with Python
• MUTIS - Lucene implementation in Delphi
• Ferret - Lucene implementation in Ruby

http://wiki.apache.org/lucene-java/LuceneImplementations

Answer 10

JTS, Java

• GEOS, port to C++

Answer 11

Log4J, Java

• Log4cxx, C++
• Python logging, Python
• log4net, .NET

Answer 12

Java,Java

• C#, .NET

_{Ohh com'on, just kidding, ok, down vote me now!}

Answer 13

wxwidgets

c++ and others

Answer 14

TagLib-C++ "TagLib is a library for reading and editing the meta-data of several popular audio formats."

• TagLib#, C# (Mono/.NET)

Answer 15

• Esper
• NEsper

A library for complex event processing.

Answer 16

GTK, originally in C.

Ported to Java, Python, Ruby, C++, and most every other common language you can think of.