GSS is a JavaScript layout engine based on Grid Style Sheets (constraint CSS) using Cassowary constraint solver. It enables declarative relational layouts—expressing 'item A aligned to the right of item B'—and compiles these constraints into standard styles at runtime or build-time. Though experimental and labeled unstable, it showcases advanced layout paradigms beyond traditional CSS.
FormLayoutBuilder is a WYSIWYG tool that enables you to easily build Java Swing layouts using the JGoodies FormLayout layout manager. Perfect for those that hate IDE form builders but need powerful layouts fast.