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Here is a good list best and most recommended as per professional webmasters advice:-
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| American Classifieds | 
 
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| Free Classifieds | 
 
http://www.CraigsList.Org
 
PHP Classifieds is the best classifieds software which has a set of features that you just cannot find in any other script. It is the complete solutions to run a great classified ads web site. Here is a glimpse of its HOT & NEW FEATURES:
- Fully Optimized for search engines. Gives you loads of free traffic.
- Each classified & category has separate meta keywords,description & title tag (NEW) Search engines will love your web site.
- Zip code distance search & Google Maps support. (NEW) Makes your site prefect for local & global use.
- Run as Global or Local classifieds site. You set which countries/regions to enable.
- You can define your own additional fields to ask for specific info on item posting page. E.g. for computer classifieds you can add Processor or Memory space fields. You can also have different fields for different categories. So, you can use this php classifieds script for any niche.
- Video ads through Youtube video support. Give video ad option to advertisers without any bandwidth cost.
- Image gallery & Video gallery (NEW) with each classified. It is wonderful attraction for your advertisers.
- Even a free classified ads site will earn for you. Because of multiple revenue streams (see below).
- Publish google ads or any text or banner ads using inbuilt ad publishing system.
- Set colors & icons from admin panel. No HTML knowledge required for this.
- Full control over web site content. Plus an automatic rude word filter.(NEW)
- Web site promotion tools like social book marking and RSS Feeds . Sharing and feed-readers do it for you.
- Full Internal messaging system with inbox, outbox, contact list, block list etc is a perfect communication tool for buyers and sellers.
- Lots of security features like Captcha SPAM protection, MD5 Encrypted passwords etc.
- Inbuilt database backup utility. All this make this script really our #1 classified ads script.
- Support for many payment options like Paypal, Authorize.net, e-gold, 2checkout and offline payments.
- Plus we also provide service for integration of additional payment gateways.
- Fully Front end language translatable. So, you translate all text strings that come from one file into language of your choice. And that is it. The data that comes from db comes in language in which it is entered. So, run the script in any language of your choice like English, German, Spanish, Italian, French, Arabic etc.
- FREE Technical Support , just in case you feel stuck with something.
It is definitely the best script you will ever find to run your classified ads web site.
All these and many more amazing features packed into one script for a cost of JUST : $99
MAJOR REVENUE STREAMS THAT PHP CLASSIFIEDS SCRIPT GENERATES FOR YOU:
- Earning from classified posting fees.
- Earn more from home page featured and video featured ads
- You can also charge for image posting or video posting
- You can also create bulk advertising packages for your bulk advertisers like "Post 5 classified ads for $100".
- Charge for the paid options like featured classifieds, bold classifieds, highlighted classifieds etc.
- Publish banner ads or Google adsense ads on your web site.
- Due to classified script's Search Engine Optimization features, you can generate free traffic. This traffic can be used to promote your products for indirect revenue.
- You earn further by extension of classifieds that have already expired. In our classifieds software, you can charge a per day extension fee for this.
 
 
SOME TYPICAL SMART USES OF OUR CLASSIFIED SCRIPT:
- Start your dedicated classifieds portal and tap scripts full revenue generation potential.
- Launch a free classified ads service and bring new visitors and possible clients to your web site. Plus earn big by putting google adsense ads on the web site.
- Many of our clients use php classifieds as advertising platform for their products / portals. Or they sell their products thru it.
- You can also use it for creating search engine optimized unique content. Which in turn increases value of your web site. in the eyes of search engines.
- Hook visitors by providing better content and offers. It helps in enhancing your web site's image and the user experience.
DETAILED FEATURE LIST FOR PHP CLASSIFIEDS SCRIPT
PHP CLASSIFIEDS SCRIPT (FRONT END FEATURES)
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Admin configurable colorsAdmin configurable iconsEnable specific countries / regionsRude word filterUnlimited color schemesUnlimited icon setsMany color schemesCreate new color schemesFront end Language translatableSocial Book markingRSS FeedsRun as Global classifieds siteRun as Local classifieds siteMultilevel category structureUnlimited categoriesDefine your own categoriesQuick SearchZip code distance searchAdvanced searchFeatured Video ad galleryPremium storesCaptcha spam protectionMD5 Encrypted passwordsAutomatic Email verificationMy Store page | 
Automatic password retrievalInternal communicationContact list, Block list etc.Separate meta tags with adsWYSIWYG editor for ad postingPaypal buy now featureImage gallery with each classifiedVideo gallery with each classifiedYoutube integration (NEW)Google Maps integrationDynamic thumbnailingFavorite ad listConvenient automatic email alertsMy accountTransaction historyMultiple secure payment optionsPaypal, Authorize.net (NEW)E-gold, 2checkoutReal time statsAd publishing systemPost banner/text adsGoogle ads / affiliate ads | 
CLASSIFIEDS SOFTWARE (SEO FEATURES):
- Great search engine visibility of classified pages and category pages
- URL rewriting (using apache mod_rewrite module) for all the classified ad's detail pages along with separate meta tags
- URL rewriting of all category pages in a multi level hierarchical manner for better Search Engine Visibility
- SEO optimized to provide you better visibility in search engines (by using separate meta tags for each classified and category)
- Separate TITLE, meta description and meta keywords etc. for each ad and category
CLASSIFIEDS SOFTWARE (ADMIN AREA FEATURES)
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Category managementCreate, Edit, Remove categoriesSEO enabled (with unique meta data)Unlimited depth of category structureChecks against accidental deletionCategory specific fieldsShift classifieds between categoriesReal time statsRecent activity statsVarious other statsConfigure site parametersConfigure colors and iconsSet results per page for searchSet many other similar parametersImage upload size restrictionEnable email verificationSwitch URL rewriting modeSet auto member approvalSet auto listing approvalManage various SEO parametersSet SEO URLsSet listing layouts (search results)Upload your logoDynamic image thumbnailingMass thumbnail regenerationWatermarking thumbnailsCreate color schemesUpload iconsSet time zonesGoogle Map parametersManage youtube videos | 
Define policiesGet .htaccess codeConfigure automatic emailsOffer signup bonusSet billing accountsSet posting feeSet enhanced listing feesCharge category specific feeCharge of image uploadingClassified ad managementKeyword / Status searchAccept / reject adsChange or remove adsCreate additional fields for listingsClean-up routinesClean unused photosClean unused icons etc.Clear old listingsUser site membersFind by name/keyword or idMark premium storesEdit user profilesSuspend or remove membersManage financial transactionsCredit or debit member accountsCheck visitor messagesBanner & text ad publishingUnlimited ad slotsUnlimited adsAdsense also supported 
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Free Classified Script - OFFER #2
Do you want to own a website that offers free classifieds to your visitors/advertisers?
Here it is - one of the best, used, tested by professional webmasters. The script is one of the most established and robust in the market by industry standards.

 
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FREE CLASSIFIED SCRIPT FEATURES
Site Settings
Change Site Title, Keywords and DescriptionEnable/Disable WYSIWYG Editor for ad postingChange site LogoActive/Inactivate Ads auto ApprovalUser Registration Required or not with option  Yes/NONotifier: A HTML or plain text message appear on home page after defined seconds, You can use this option for optin form or any message for visitors. If you leave it blank, no message will appear for visitors.Google Analytics: Simply Put good analytics code or any other code for tracking.Google Map Key: You can have map on site for each listing. 
 
Google adsense and Banners
Here You Simply put google adsense code  or any affiliate and static banner code to display on different position in site. 
 
Listing settings
In this section you control Number of listing display for each page that include Home Page New ads, Category Page, Sponsred ads on home page, Sponsored ads on Category Page.Here You can also define view of listing in Gallery or List View. 
 
Site Themes/Design
This is one of the most frequently asked features - i.e site themes/design.  You can now choose or change design for your site with single click.  Other than the standard, available themes, you can also request us for custom design. | 
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Selling Features
Unlimited number of packagesAssign packages to certain user groups.Set the number of days a listing will run.Include the price for the package.Paypal Payment installed. | 
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Categories
Add unlimited categories and sub categoriesYou can also put here Top and left banner for each category. If you leave it blank then default banner will display that you may define in Banner section.If you want to charge for specific category for ad posting, here you can define price for that categoryYou can control category Order to display on front side and can have icon with category name.Insert title, keywords, and description | 
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Listings
Auto Delete Expired ListingsImage Upload with thumbnail creationUnlimited Number of extra fieldsEnhanced options like bold, featured, highlighted.Included plugins to show listings on home page.Contact the owner with email or private message.Add listing to your favoritesSearch all listings by keywords, extra fields, or by categories.RSS Feeds for listings. Can pass parameters to change what is included.Printer Friendly viewCounts the number of views for each listing plus the number of views from the category and search page. | 
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Category Extra Fields
These are not just extra fields, it can play very important role in your site, there you each category can have different fields for ads.You can have property, automotive, personals, employment categories and more, all in one. For example for autos, You want fields, Model, Kilometers, Body Type etc. and for Real Estate You want fields, Bedroom, Amenities etc.. When user click on specific field to post ad, fields will display accordingly.Unlimited number of extra fields can be created.Includes Text fields, multi line fields,  combo boxes, checkboxes, radio buttons. | 
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Users
Manage all aspects of your users.Private Message SystemPowerful user notes system. |