Less language is an extension of css and less4j compiles it into regular css. It adds several dynamic features into css: variables, expressions, nested rules.
Less4j is a port. The original compiler was written in JavaScript and is called less.js. The less language is mostly defined in less.js documentation/issues and by what less.js actually do. Links to less.js:
* home page: http://lesscss.org/
* source code & issues: https://github.com/cloudhead/less.js
Artifacts using Less4j (47)
1.Mangoo I/O Core11 usages
io.mangoo » mangooio-core Apache
Mangoo I/O Core
Last Release on Oct 25, 2026
Default implementation for XWiki Platform - LESS CSS - Default Implementation
Last Release on Oct 15, 2026
Arras Bootstrap provides simple way to include Twitter Bootstrap's less files into a project.
Last Release on Jun 15, 2026
10.Grooves Diagrams
com.github.rahulsom » grooves-diagrams Apache
Asciidoctor Extension to generate Event Sourcing Diagrams like those on https://rahulsom.github.io/grooves
Last Release on Oct 27, 2026