E-stores/shopping carts, one-click installation via cPanel or cPanel/Fantastico:

AgoraCart
Perl based shopping system.

ClickCartPro
Feature rich, flexible, secure Perl based Ecommerce system.

CubeCart
An easy to use yet powerful shopping cart featuring unlimited categories and products, multiple payment gateways, downloadable products. The design is very easy to modify.

osCommerce
A power-user shopping cart with a big variety of modules and support of almost every payment gateway. A big developers community is ready to offer custom solutions depending on your needs.

Zen Cart
Zen Cart truly is the art of e-commerce; a free, user-friendly, open source shopping cart system. The software is being developed by group of like-minded shop owners, programmers, designers, and consultants that think e-commerce could be and should be done differently.

Image galleries:

An Image Gallery system featuring unlimited categories/subcategories, web-based and FTP images upload, auto-thumbnails, comments, send a picture, rate a picture, random pictures, extensive administration panel.

An Image Gallery system featuring categories and albums, thumbnails and intermediate size pics, search feature, new and random pictures, user management (private galleries, groups), user comments, e-cards feature, slide show viewer.

An Image Gallery system featuring albums within albums, thumbnailing specific picture area, captions, rotate, reorder pictures, album-based attributes, album mirroring.

Blog site builders, one-click installation via cPanel or cPanel/Fantastico:

b2evolution
A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

Nucleus
A powerful blog script featuring multiple blogs, multiple authors, drafts and future posts, bookmarklets.

WordPress is a blogging software with a focus on ease of use, elegance, performance, and standards with a huge selection of themes and plugins.

Web forum builders (discussion boards), one-click installation via cPanel or cPanel/Fantastico:

YaBB
Secure, feature-rich Perl based forum.

phpBB3
A widely-popular open-source bulletin-board package, works well, simple user interface and admin panel, clean look, scales well, and can be customized.

SMF
Elegant. Effective. Powerful. Free. SMF is all of the above. SMF is a next-generation community software package and is jam-packed with features, while at the same time having a minimal impact on resources.

Full website/CMS builders, one-click installation via cPanel or cPanel/Fantastico:

An advanced portal with collaborative book, search engines friendly URLs, online help, roles, full content search, site watching, threaded comments, version control, blogging, news aggregator.

A portal system with a wide range of modules.

Joomla! is one of the most powerful Open Source Content Management Systems on the planet. It is used all over the world for everything from simple websites to complex corporate applications. Joomla! is easy to install, simple to manage, and reliable.

A professional level yet easy to use Content Management System featuring inline WYSIWYG content editors, news feeds, syndicated news, banners, mailing users, links manager, statistics, content archiving, date based content, 20 languages, modules and components.

One of the most popular community-based portals with a big choice of modules and languages.

phpWCMS is perfect for professional, public and private users. It is very easy to learn and gives you the flexibility to separate layout and content. Lots of powerful but simple implemented features assists publishers and web developers too.

Very powerful Content Management System with document manager, announcements, menu manager, photo album, block maker, FAQ, web pages maker, polls, information categorizer, calendar, link manager, form generator.

A Content Management System with focus on flexibility and security. A big variety of modules and blocks makes this CMS an all round tool.

A straightforward content-management system designed for rapid deployment of community-based websites. Nice-looking templates, oriented toward document-sharing, clean interface.

TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extensibility while featuring an accomplished set of ready-made interfaces, functions and modules.

A very popular advanced portal system.

Polls and survey packages, one-click installation via cPanel or cPanel/Fantastico:

Advanced Poll
A highly windows-inspired poll script.

LimeSurvey
LimeSurvey (formerly PHPSurveyor) is an open source online survey application. It enables users to develop, publish and collect responses to surveys. Surveys can include branching, custom preferred layout and design (using a web template system), and can provide basic statistical analysis of survey results. Surveys can be public, or can be strictly controlled through the use of "once-only" tokens for each survey participant.

phpESP
PhpESP is an effective, capable, web-based survey application that enables businesses to create complex and advanced surveys, view results in real time, and carry out advanced analysis.

Customer relationship packages, one-click installation via cPanel or cPanel/Fantastico:

Crafty Syntax Live Help
A Live Help chat system featuring monitor your visitors, proactively open a chat session, multiple chat sessions, referrer tracking, page view tracking, multiple operators, canned responses/images/URLs, multiple departments each with different icons, leave a message.

Help Center Live
Very powerful all-in-one help center including Live Help, Support Tickets and FAQ. Features include unlimited operators/departments, monitor visitors, initiate chat, collect visitor's information, track visitor's footprint, auto save chat transcripts, canned messages, leave a message, auto-assign tickets to operators, unlimited FAQ topics.

osTicket
A Support Tickets system featuring email piping, pop3 login, unlimited email addresses, admin/staff/user panels, avoid auto-responder loops, limit maximum tickets user can have opened, accept attachments and limit size, pager alerts for admin.

PerlDesk
PerlDesk is a feature packed browser based help desk and email management application designed to streamline the operation of managing emails, support tickets and customer communications, with built in tracking and response logging it is an ideal help desk solution for companies with one or more members of staff or for those who want to organize client communications.
NOTE: Publisher license purchase required.

PHP Support Tickets
A widely-popular open-source bulletin-board package, works well, simple user interface and admin panel, clean look, scales well, and can be customized.

Support Logic Helpdesk
A simple, one-admin Support Tickets system featuring self-registering, emailing to admin, attachments.

Support Services Manager
An up and coming support services system, easy to manage with broad capability.

cPSupport
Perl/MySQL based support ticket system

Website utilities via or cPanel/Fantastico:

Advanced Guestbook
PHP/MySQL based guestbook

Random HTML Generator
This is a Random HTML generator. It picks a string of HTML code from a list and inserts it in an SSI (Server Side Includes) enabled web page.

Counter
A counter with multiple style options to count and show how many visitors have been to your site.

Clock
This utility will create a real time java clock for your site.

Countdown
You can create a countdown box to countdown to a specified date.

CGI email
CGI Email takes the input of an HTML form and converts it to an email format defined by the author of the form.

FormMail Clone
FormMail-clone is a (secure) clone of Matt Wright's FormMail.

Entropy Search
Will establish a site specific search engine.

Entropy Banners
This feature allows you to create rotating banner ads for your site.

Project Management packages, one-click installation via cPanel or cPanel/Fantastico:

DotProject
Project Management featuring companies, projects, tasks (with Gantt charts), forums, files, calendar, contacts, tickets/helpdesk, language support, user/module permissions, themes.

PHProjekt
Project Management featuring optional group system, privileges, calendar, contacts, time card, projects, chat, forum, request tracker, mail client, files, notes, bookmarks, to-do list, reminder, voting, language support.

Wiki builder packages, one-click installation via cPanel or cPanel/Fantastico:

TikiWiki CMS/Groupware
TikiWiki is designed to be an international, clean and extensible Content Management System and Groupware that can be used to create all sorts of web applications, sites, portals, intranets and extranets. TikiWiki also works great as a web-based collaboration tool. TikiWiki has a lot of native options and sections that you can enable/disable as you need them.

PhpWiki
PhpWiki is a web site where anyone can edit the pages through an HTML form. Linking is done automatically on the server side; all pages are stored in a database.

Other packages, one-click installation via cPanel or cPanel/Fantastico:

Noahs Classifieds
A classifieds system featuring categories and subcategories in unlimited depth, image upload for categories and classifieds, variable fields per categories, customizable email notifications, locking categories, classifieds approval, auto-thumbnail generation, classifieds management by user, send classified to a friend.

PHPlist
A powerful mailing list featuring multiple mailing lists and attachments.

Dew-NewPHPLinks
A Link Directory featuring categories, reviews, popular links, new links, links approval.

Moodle
A course management system designed to help educators create quality online courses. Available in 34 languages and features a WYSIWYG HTML editor. The teacher has full control over all settings for a course. There is a flexible array of course activities (Forums, Journals, Quizzes, Resources, Choices, Surveys, Assignments, Chats, Workshops), user logging and tracking, mail integration and much more.

Open-Realty
Real Estate listing system featuring attachments, flexible search, template system, Yahoo Maps interface.

phpAdsNew
A highly professional complete ad server featuring different types of ads, display based on keywords, zones, hour of the day, day of the week, extensive statistics, client statistics.

PHPauction
The GPL version of PHPauction featuring email notification of bids, attachments, reserve price, minimum bids, standard and dutch auctions, bid history, send auction to a friend, highest bids, auctions ending soon.

phpFormGenerator
A form generator featuring up to 100 form fields, all kind of input fields incl. file upload, customizable fields attributes, send submitted data to an email address or store them in a database, admin panel.

WebCalendar
A very powerful web calendar featuring private and public calendars.

Scripting/coding facilities: