PUBLISHER'S NOTE: Please note that, as of 9\/29\/03, all of your valued Network World Fusion newsletters will be delivered to you from nwfnews.com. If you use filters to manage your newsletters based on domain name, please adjust accordingly.Last in our series of open source business software suites is CK-Ledger. CK-Ledger is yet another platform based on the popular PHP and MySQL systems.The system can be used to create basic accounting and business applications, as well as front-end point of sale (POS) input systems, and even slick employee self service applications for changing personal information and other data. A hierarchical management structure is used to manage end users' access to the system and for auditing purposes.The system uses Web-based interfaces for user-facing applications, with support for Netscape, Mozilla, Opera and Konqueror. Apache and PHPGroupware (an open source middleware suite) are used to execute transactions between the front end and back-end databases. MySQL and PostgreSQL are supported for database management.The package includes a host of different modules for various business functions that can be installed piecemeal or all together. They include: Ledger Administration, Bank Reconciliation, Inventory, Service, Accounts Payable, Accounts Receivables, POS for Cashier, POS for Managers, Human Resources, Staff Self Service and Payroll.\u00a0If you're worried that Larry Ellison will buy out your favorite ERP\/CRM company, discontinue their products, and force you to migrate to Oracle, now might be a good time to take a look at an open source alternative. And who knew there were so many open source software packages for running a business?If I missed any packages out there, I'd love to hear about them for future newsletters. Also, if anyone has installed and tried out any of the ERP\/CRP\/POS systems covered over the last two weeks, I'd like to hear your feedback.