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This is a PHP class that allows you to do unix/linux man page lookups from your website. Easy to use, and produces the results in a nicely formatted layout. It allows you to search with keyword and section numbers, and also display a list of all those found starting with a particular letter, or all starting with digits, or non-alphanumeric characters, etc. This class now includes the ability to cache your results for much faster lookup, and also has a timer built in so that you can guage just how long it takes to display your results.
Price: Free for non

ClientExec is a tool to help web hosts manage and support their clients efficiently. Unlike many client management packages, ClientExec does not try to be all things to all people; you are in control. We want it to be a natural addition to your business, a powerful tool you use, not get lost within. Top features include power customer management, recurring invoicing, ICQ event notification, integrated helpdesk and tons of 3rd party payment processor support. Autowithdrawal for authorize.net accounts now integrated into CE
Price: Free Trial / $99

Easy to setup domain name and hosting shopping cart. Checks availability of domain names and allows user to lookup existing ones. Supports over 400 domain extensions such as .com, .net, .org, .co.uk, .name, com.hk, .my etc making it one of the most comprehensive domain carts on the market. Optionally allows the user to select a hosting package for each domain name. Now has both full shopping cart and simple hosting modes. Fits into your existing page layout.
Price: $29.95

PHP class that will allow you to parse a ISC DHCPd v3 leases file and use the results in your applications. It was written because the only other implementations I could find were written PERL.
Price: GPL

DomainCP allows you to resell ev1servers.net domains ($7 per domain per year). No setup fees, no any additioanl payments. You just register domain at ev1servers and give your customer a link to DomainCP.This is an OpenSRS control panel wrapper and allows your customers to manage any domain registered with OpenSRS.Fully customizable interface, language translation supported.
Price: $29.00

DomainsAide the most complete and stable domains name tool available. Our unique features include the popular Name Suggestions, Future Expires, Name Registration and state of the art, Yahoo and DMOZ directory watcher, providing immediate email notification for expired names still listed in these directories. Script allows setup of your own expired domain membership service using Paypal, with fully automatic billing. Branded resell programs available. Now search for PendingDelete and RedemptionPeriods.
Price: 9.95/99.00

DRAMS is a powerful, scalable and fully customizable domain registration package. Based on the PHP language, backed with a blisteringly fast MySQL back-end database, DRAMS is the ideal registry solution for all eNom domain name resellers. DRAMS is template based, allowing for any look to be integrated easily. With a built in user system, hosting a retail domain business has never been easier. DRAMS comes complete with a built-in payment processing system. This allows all registrations to be processed LIVE! With DRAMS you will have immediate processing of registrations, renewals, transfers, and payments.
Price: $60.00

This is a simple dynamic DNS client written in PHP (4) especially for dyndns.org. It conforms to DynDNS NIC v2. It runs in the background and updates your IP address in the DynDNS database whenever it has changed.
Price: Free (GPL)

EAPI is a PHP class object that allows you to interface with the Enom.com(tm) server and parse templates for visual use. The object can be used as a direct working interface between a human user and the Enom.com (tm)test or live servers, and can be used as a working component inside of any PHP project. It is well encapsulated making for easy and quick integration into any existing system. Full source code.
Price: $20.00

Automated Plesk signup setup and billing system. Features: Automated domain search and registration (supports major registrars); Built in billing system uses PSA database; Automatic setup of client in billing system from signup; Set monthly, quarterly or annual billing; Client automatically set up on your PSA servers; PSA 2.x.x and PSA 5.x supported; Automatic connection and processing through your payment gateway. You will never need manually set up another hosting account.
Price: $299.00