Amzi! 10.x is now an open source release. The very stable 9.x release of the software will remain as a supported commercial version. Amzi! Prolog source code debugger showing call stack, variable bindings, source code at a REDO port, index of predicates, and executing code. Amzi! Prolog Logic Server is an embeddable, extendable, highly portable implementation of ISO standard Prolog, including full support for ISO modules enabling large-scale application development. A rule language and reasoning engine that is embeded in Excel, allowing for the development of rule and pattern-matching applications integrated with Excel spreadsheet data.