Weld is a development tool designed to help developers quickly and easily create applications and websites. It provides an intuitive graphical user interface that allows developers to quickly develop and deploy applications without having to write any code. Weld provides a wide range of features, including drag-and-drop development tools, automatic code generation, and integration with other development tools. It also includes debugging and performance optimization tools, and allows developers to quickly deploy their applications to various platforms, including mobile devices. Weld makes it easy for developers to create and maintain applications and websites, making it a great choice for both experienced and novice developers.
The discontinued Macaw was acquired by InVision: http://macaw.co/invision/ The latest version, 1.6, released in January 2016, can still be downloaded from the official website.