LINE Design System unifies the design language across LINE's messaging app and family of services, split into a Messenger-specific framework (LDSM) and a Global Family Services framework (LDSG) that both work natively across 19 languages.
It's strongest for messaging and chat-interface patterns specifically, and the split between messenger-specific and broader family-service frameworks is a useful model for any product line that has one flagship app plus several satellite products sharing a language.
Designers building chat, messaging, or multi-app product families who want a real example of managing one shared language across a flagship product and several related services.
It genuinely supports 19 languages natively, worth studying specifically for internationalization patterns beyond just left-to-right English layouts.
LINE's own UI framework, covering the foundations and components across its ecosystem.
