Rdbms

Firebird RDBMS offers many ANSI SQL features & runs on Linux, Windows & several Unix platforms.

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Developer: firebirdsql.org
License: Mozilla Public License (MPL)
Operating System: All 32-bit MS Windows (95/98/NT/2000/XP), All BSD Platforms (FreeBSD/NetBSD/OpenBSD/Apple Mac OS X), All POSIX (Linux/BSD/UNIX-like OSes), HP-UX, IBM AIX

Zope is an open source web application server primarily written in the Python programming language.

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Developer: zope.org
License: Freeware
Operating System: Windows, Solaris, Linux

Chatty :) is a very nice script that lets you create a simple but very-good looking chat in a few minutes.

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Developer: www.olivo.net
License: GNU General Public License (GPL)
Operating System: linux, windows, freebsd, osx, sun

Download4J is 100% JAVA component (Servlet + JavaBean) that allows to download files.

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Developer: JavaZOOM
License: Freeware
Operating System: Linux, Unix, Windows

A litte tool to create an alter-script for the differences between two databases.

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Developer: Lippe-Net
License: Freeware
Operating System: Apache/PHP