Xoops

XOOPS is a dynamic OO (Object Oriented) based open source portal script written in PHP.

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Developer: http://www.xoops.org
License: Freeware
Operating System: win, linux, unix, etc

ImpressCMS originally evolved from XOOPS.

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Developer: Tom Black
License: GNU General Public License (GPL)
Operating System: UNIX, Win NT, XP, etc. + MYSQL + Apache

ImpressCMS originally evolved from XOOPS after a number of developers decided another path would be more suited to them and that path we now think is an impressive one.

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Developer: ImpressCMS Team
License: Freeware
Operating System: Linux, Unix, Windows

Superclock is a multi-platform compatible very customizable day/date/time script with an attractive beveled border that uses your own custom background image.

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Developer: SpriteWorks
License: Freeware
Operating System: Unix/Linux/Windows

Superwin is a multi-platform compatible highly-customizable pop-up window script.

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Developer: SpriteWorks.com
License: Freeware
Operating System: Unix/Linux/Windows

NoPeek is a "no-right-click" script (without the prompt/alert) for webmasters wanting a polished, professional look.

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Developer: Spriteworks Developments
License: Freeware
Operating System: Linux, Unix, Windows

MiG (My Image Gallery) is a photo album / image gallery viewer written in PHP.

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Developer: Dan Lowe
License: Freeware
Operating System: PHP