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OpenLaszlo is an open source platform for creating zero-install Web applications with the user interface capabilities of desktop client software.

OpenLaszlo programs are written in XML and JavaScript and transparently compiled to Flash and soon DHTML. The OpenLaszlo APIs provide animation, layout, data binding, server communication, and declarative UI. An OpenLaszlo application can be as short as a single source file, or factored into multiple files that define reusable classes and libraries.

OpenLaszlo is "write once, run everywhere". An OpenLaszlo application developed on one machine will run on all leading Web browsers on

What's New in OpenLaszlo

Version 4.9.0:
  • This version is a significant release along the path to Openlaszlo 5.0, which is the upcoming release with newly redesigned components. OpenLaszlo 4.9 contains over 160 bug fixes and implements the infrastructure to support the new components. It also provides new features for creating and deploying mobile applications.

Requirements for OpenLaszlo

  • Mac OS X 10.3.9 or later
  • Java 1.4 or later
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OpenLaszlo User Discussion

5 1
Current Version (4.x)
Downloads 18,563
Version Downloads 1,511
License Free
Date 22 Oct 2010
Platform OS X / PPC 32 / Intel 32
Price Free
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