Verification
Keyword Verification - top search engine placement is multi-platform compatible.
More Info 
Developer: http://www.instantpositi...
License: Freeware
Operating System: All
Called.
Developer: called.in
License: Freeware
Operating System: All
DRBImageVerification is a simple anti-spam image verification, or CAPTCHA, script.
Developer: Don Barnes
License: Free To Use But Restricted
Operating System: All
Free online email checker allows you to check and confirm the existence, validity and syntax of an email address.
Developer: Ananya
License: Freeware
Operating System: Windows, Unix
Easy to use contact form form script with captcha image verification against spam.
Developer: adrianTNT
License: Freeware
Operating System: Linux
WebSpamProtect.
Developer: webspamprotect.com
License: Freeware
Operating System: All
WebSpamProtect.
Developer: webspamprotect.com
License: Freeware
Operating System: All
A web based mailing list management script that supports email validation, address pin verification and the ability to subscribe and unsubscribe at any time.
Developer: http://mojo.skazat.com/
License: Freeware
Operating System: All
eAuction allows everyone to set up a powerful and multilingual online auction site.
Developer: Dieter Werner
License: Freeware
Operating System: Linux / Win
Bacula is a set of computer programs that permit you (or the system administrator) to manage backup, recovery, and verification of computer data across a network of computers of different kinds.
Developer: bacula.org
License: GNU General Public License (GPL)
Operating System: 32-bit MS Windows (NT/2000/XP), 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), FreeBSD, Linux, NetBSD, Solar
Keep your visitors from submitting their form until their "password" and "re-enter password" fields match, for verification purposes.
Developer: http://javascript.intern...
License: Freeware
Operating System: All
InSite is multi-platform compatible.
Developer: Jason Priebe
License: Freeware
Operating System: Unix/Linux/Windows
Unlike many other free captcha image verification scripts, this script is designed with the state of the art in captcha-defeating software in mind.
Developer: Han-Kwang Nienhuys
License: Freeware
Operating System: Linux, Unix, Windows
User Authentication Class with Database Class is multi-platform compatible.
Developer: Codewalkers
License: Freeware
Operating System: All
vSignup is multi-platform compatible.
Developer: Vincint Ong
License: Freeware
Operating System: Unix/Linux/Windows
*Automatic user subscription *Automatic verification of backward links *Automatic retrieval of Google Page rank of the sites linking back *Automatic retrieval of Alexa Page Rank *Automatic generation of link pages on all member sites *Automatic password reminding features Complete user, site and category management * FREE 12 SEO Tools.
Developer: linksxs.com
License: Freeware
Operating System: All
A free, double opt-in mailing list for your website.
Developer: aardvarkmailinglist.net
License: Freeware
Operating System: All
Form Processor by Ascad Networks will support all types of fields, including textareas.
Developer: Ascad Networks
License: Freeware
Operating System: Unix/Linux
Reciprocal link exchange management script.
Developer: www.sourceworkshop.com
License: Freeware
Operating System: Unix, Linux
Webinsta Mailing list manager was built to provide a centralized mailing list / newsletter system for small to medium website.
Developer: vikas
License: Freeware
Operating System: Windows Unix