Folgende
IDE's sind auch in Delphi/Kylix geschrieben.
Das steht zumindest so bei sourceforge.net in der Beschreibung
Ich habe nur mal die ersten Vier rausgesucht, es existieren noch viele mehr 
http://sourceforge.net/projects/dev-cpp/
Dev-C++ is an full-featured Integrated Development Environment (
IDE) for
Win32. It uses GCC, Mingw or Cygwin as compiler and libraries set.
Development Status: 6 - Mature
Environment:
Win32 (MS Windows), X11 Applications
Intended Audience: Developers, End Users/Desktop
License: GNU General Public License (
GPL)
Natural Language: English
Operating System: Windows 95/98/2000, Windows NT/2000, Linux
Programming Language:
Delphi/Kylix
Topic: Software Development
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http://sourceforge.net/projects/devphp/
Dev-PHP is a full-featured Integrated Development Environment for PHP. It's fast, powerful and has a user-friendly interfase. It has many cool features, like Function browsing and full integration with the PHP parser and the PHP-GTK library.
Development Status: 3 - Alpha, 5 - Production/Stable
Environment:
Win32 (MS Windows)
Intended Audience: Developers, Education, System Administrators
License: GNU General Public License (
GPL)
Natural Language: English, Spanish
Operating System: Windows 95/98/2000, Windows NT/2000
Programming Language:
Delphi/Kylix, PHP
Topic: Dynamic Content, Interpreters, Integrated Development Environments (
IDE)
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http://sourceforge.net/projects/open-perl-ide/
Open Perl
IDE is a visual, integrated development environment for writing and debugging Perl scripts with any standard Perl distribution under Windows 95/98/NT/2000.
Development Status: 5 - Production/Stable
Environment:
Win32 (MS Windows)
Intended Audience: Developers
License: Mozilla Public License 1.1 (
MPL 1.1)
Natural Language: English
Operating System: Windows 95/98/2000, Windows NT/2000
Programming Language:
Delphi/Kylix, Perl
Topic: Debuggers, Integrated Development Environments (
IDE)
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http://sourceforge.net/projects/basic-ide/
The BASIC
IDE is an open source
IDE for the RapidQ programming language. It has an flexible code editor and form designer for all the RapidQ components. Future additions include Code Tip and Code Completion. The
IDE is written in Object Oriented Delphi.
Development Status: 3 - Alpha
Environment:
Win32 (MS Windows)
Intended Audience: Developers
License: GNU General Public License (
GPL)
Operating System: Windows
Programming Language:
Delphi/Kylix
Topic: Code Generators, Integrated Development Environments (
IDE)