• Shorty: Shorty is a simple tool for creating shorter, human- readable links from long URLs. You install Shorty on your server, so the links you create with it never go away.
  Demo || Download
• Phurl
  Phurl is a free, clever, and easy to use PHP URL shortening system. In just 5 minutes, you can get your very own URL shortener set up and working. The script comes packed with a ton of features which you won’t find in other scripts, and has a very easy installation wizard to help you get started.
  Demo || Download
• YOURLS
  YOURLS is a small set of PHP scripts that will allow you to run your own URL shortening service (a la TinyURL). You can make it private or public, you can pick custom keyword URLs, it comes with its own API. You will love it.
  Demo || Download
• TightURL
  If you want or need to run your own version of TightURL, TinyURL, MakeAShorterLink, or Shorl, you’ve come to the right place. If you’re running a redirector like lilURL and need some relief from phishing and spamming abuse, so you need TightURL.
  Demo || Download
• BrokenScript
  BrokenScript is a URL shortening service that allows you to shorten long Internet addresses for easy reference
  Demo || Download
• Short URL script
  A PHP ‘short URL’ script which allows you host a URL shortening service for either your own benefit or for your websites visitors. This script is very simple and stores all the data in a single file. Users simply input their long URL into the field, click the button and are returned a short URL.
  Demo || Download

• chevereto: It is powerful and featured free image hosting script. It support multilingual, and enhanced user interface with some cool Query effect.
  Demo || Download
• Image Hosting Script – DPI: Another very good image hosting script. The script need no database, and is fast in performance. It also support user gallery, Image Watermarking and many other good features.
  Demo || Download

• Magento: Magento is an Open Source ecommerce web application launched on March 31, 2008. It was created by Varien, building on components of the Zend Framework.
• Zen Cart: Zen Cart truly is the art of e-commerce; free, user-friendly, open source shopping cart software. The ecommerce web site design program is being developed by group of like-minded shop owners, programmers, designers, and consultants that think ecommerce web design could be and should be done differently.
• Freeway: Freeway is by far the largest and most fully featured Open Source eCommerce platform. It doesn’t just sell products but extends to sell in some very fancy new ways and is very configurable. For example, you can just sell products if you are not interested in the other selling methods. You will find Freeway has very strong CRM features as well as a useful and simple CMS as well.
• osCommerce: osCommerce is an online shop e-commerce solution that offers a wide range of out-of-the-box features that allows online stores to be setup fairly quickly with ease, and is available for free as an Open Source based solution.
• OpenCart: OpenCart is an open source PHP-based online shopping cart system. A robust e-commerce solution for Internet merchants with the ability to create their own online business and participate in e-commerce at a minimal cost. OpenCart is designed feature rich, easy to use, search engine friendly and with a visually appealing interface.
• PrestaShop: PrestaShop e-Commerce Solution was built to take advantage of essential Web 2.0 innovations such as dynamic AJAX-powered features and next-generation ergonomy. PrestaShop guides users through your product catalog intelligently and effortlessly, turning intrigued visitors into paying customers.
• phpShop: phpShop is a PHP-powered shopping cart application. It is released under the GNU General Public License. The primary purpose of phpShop is to provide a simple shopping cart solution that is easy to customize to suit any purpose. phpShop has less features that many other shopping cart applications, but is generally easier to customize.

After you have selected the script, your next need is finding some good website designers. The default theme of these open source scripts is not that attractive. You should hire an expert ecommerce website design company to give your website unique and professional look. Look of ecommerce website is very important to put good impression on buyers. Designer will also customize your website according to product you are selling. They will also setup other required things like, payment gateway, shipping method etc.

You should select the script which has good support and large community. Yon can try demo of these scripts to see how script works before installing on your hosting account. Demo link can be found on respective website.

1. osDate : osDate dating and matchmaking script fully integrates with major bulletin boards (phpBB, vBulletin, etc.) and FlashChat, and provides several payment modules, multiple skins, and free upgrades. The .zip or .tgz downloads below are over 30MB.
2. DitSilver : It has two version. dotSilver Network Dating Software and Adult Dating Network Software.
3. Dolphin : Match, MySpace, YouTube, Flickr, Odeo and Facebook combined, free Web 2.0 software. Create a unique community, social network, or dating site instantly with the world’s most popular open-source community script.

If you any other free dating script, please post in comment. I will add it in main post.

1. AV Arcade : AV Arcade is the most feature filled FREE arcade script available. You see live demo of script here.  Download the script from here.
2. Arcadem LE : Cool web 2.0 type look, nice features. Everything you need to run a professional arcade site.  Live Demo of Script. Download Script.
3. Your Arcade Script : Free script with 500 games pack. You can buy more games pack from the site. Live Demo of script. Download script.

UPDATE:

4.  PH Arcade : PH Arcade is a full Arcade script, quick to install, with an easy to use admin panel.

If you know any other good free arcade script, please post in comment box.

phpLD : It is now the most widely used directory script on the internet. The script has many number of templates and mods available. The current free version is phpLD 2.2.0. Download phpLD 2.2.0

PHPWeby :  Look at its features:

# Unlimited categories and subcategories
# SEO friendly URLs with mod rewrite (optional)
# Link validation (optional)
# Instant payment system with PayPal
# Automatic category selection
# Automatic checking of duplicate links
# Compatible with PHPLD templates(ver 3.x, 3.3 not yet)
# Disallow/allow same link in different categories
# Powerful link editor
# Change submitted link title,pagerank,url,description,category, contact name and/or e-mail
# Automatic checking of reciprocal links and marking as invalid if reciprocal link has rel=”nofollow” or rel=”external nofollow”
# Notify Submitter of Link Submission Receipt(optional)
# Notify Submitter of Link Acceptance(optional)
# Create and easily manage e-mail templates
# Faster category adder than any other directory script
# With few clicks create hundreds of categories and subcategories
# Easily move and/or rename categories
# AJAX powered control panel
# Check Pagerank of links (baned on some servers)
# Show latest links
# Show featured links (separate page)
# Show Pagerank of links
# Visual Confirmation to prevent spamming(optional)
# Contact us page with optional visual confirmation(captcha)
# Edit administrator account
# Sql injection and xss built-in protection
# Details page for each link
# Integrated search engine
# Use many templates and change them easily with template switcher
# Set price for featured, regular and reciprocal links
# Enable/Disable featured and/or reciprocal links
# Set links per page
# Set latest/featured links per page
# Set number of subcategories on front page
# Set number of subcategories on inner pages
# Set categories and/or subcategories per column
# Set maximum number of characters for link description
# Set site title,site description and meta description
# Encrypted database passwords
# Lots of free templates
# Easily edit templates with Smarty
# Active support forum
# Compatible with PHP 5 and PHP 4, MySQL 4 and MySQL 5
# Compatible with Internet Explorer, Firefox, Safari, Opera
# Easy installation
# FREE

1) HelpCenterLive

Help Center Live is an open-source, community driven live chat & support system. You may easily provide live support on your website just like large companies do with very little work. With Help Center Live, you can provide a real-time, live support or sales person experience.

Demo HelpLiveSupport

Download HelpLiveSuppor

2) LiveZila

LiveZilla is freeware. No monthly costs, no setup fees. Use LiveZilla to chat with your website visitors and monitor your website traffic in real time. Convert visitors to customers – with LiveZilla!

Download LiveZila