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Directory script that builds search engines – friendly, static pages. Main idea is to build effective structure to maximize directory traffic potential, heavy optimization and heavy traffic volumes support. If you’re going to build a directory that can cope with huge traffic flow aeDirectory is your best bet. aeDirectory has all features of a Yahoo-like directory script, easy and powerful administration panel, classic structure, and a static pages building system.
Price: GPL

AlstraSoft Link Directory software is the perfect solution for starting a profitable link directory website just like HotScripts.com offering fully-featured directory of resources/links similar to Yahoo-style search engine. The flexibility of AlstraSoft Link Directory also allows you to manage any type of link directory. AlstraSoft Link Directory is 100% template driven, completely customizable, comes with an integrated banner advertising and sponsored links system, easy to use and navigate, and is fully controlled by a integrated Admin Control Panel.
Price: $155.00

Traffic Development Software is a free, handy and sophisticated web directory software bundle, combining the power of AJAX technology, modern design and professional support by the Boonex Community Software Experts team. This convenient web directory software is created to make your daily traffic efforts successful. Now barracuda comes with GP license.
Price: GPL

Multi-level category system, unlimited number of categories, integrated search engine, powerful control panel, search engine friendly, easily customizable. Integrated search engine. Powerful control panel: add/edit/delete/move pages and categories easily. Move full parts of the directory (subcategories and pages) with one click. Semi-automated directory: users suggest urls and you accept/reject them. IP banning. Fast loading: the pages are developed in plain CSS. No tables nor heavy code. Search engine friendly: include title, keywords and description for each category. Short querystrings (most search engines will index the directory). Easily customizable: change completely the directory appearence modifying just the style sheets.
Price: Freeware

Purchase orders invoice software provides facility to automate the entire purchase order entries and helps to create and handle the various sales and purchase orders.
Price: $0.00

SmE Starpage Host - allows you to run your own Starpage hosting service. this is a good tool for webmaster, your will be able to offer a free starpage for your visitors Create a link site with high quality links, wich will get you many visitors in return.Members add, edit, delete or aprove links,have Control about design (CSS).Admin area (delete inactive members, send mass email ,add, edit, delete categories , banners manager, backup your DB)...
Price: 55.99

Bunghole is a category index of links that have to do with heavy metal bands. As to show my support to the Open Source community, it's code has gone public. It is a link indexing system with no sub-categories. Links can be viewed sorted in many ways, has a voting system (listed sites can be rated from their sites as well) that blocks double-voting. Furthermore, it has a newsletter mailing list.
Price: Free