JFormDesigner

FlatLaf. FlatLaf - Swing Look and Feel (with Darcula/IntelliJ themes support)

markdown-writer-fx. Markdown Writer FX

swing-jgoodies-forms. JGoodies Forms: An Advanced Swing Layout System

svgSalamander. SVG Salamander - SVG engine for Java

swing-beansbinding. Beans Binding (JSR 295) reference implementation

jide-oss. JIDE Common Layer

swing-jgoodies-looks. JGoodies Looks: High-Fidelity Windows and Multi-Platform L&Fs

swing-tablelayout. TableLayout is a powerful layout manager

RichTextFX. Rich-text area for JavaFX

miglayout. MiG Layout for Swing, SWT and JavaFX