NetBeans comes with "Compile On Save" and editing support for http://sass-lang.com and http://lessframework.com out-of-the-box. No plugins required.
See you at Java EE User Interfaces, HTML 5 or Virtual Dedicated Workshops / consulting!
NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards
Airport MUC workshops: Web (SPA, PWAs, Offline, Desktop, Mobile) Applications Essentials and Effective Web Applications. No migrations. #usetheplatform
Podcast: airhacks.fm and newsletter: airhacks.news
A book about rethinking Java EE Patterns