Chatty for Google Hangouts (was Hangouts Plus) is beautiful, native desktop client for Google Hangouts which supports Hangouts video hangouts on Air and Chat.

Features

• Apple Messages UI style for Hangouts
• All-in-one design--buddies, conversations, and chat in a single window
• Support Hangouts video call
• Hangouts on Air video
• Support SMS
• Phone call with Google Voice
• Support group conversations
• Support multi-chat groups via tab
• Notifications for chat messages
• Video call via OS
• Notification Center
• Full conversation history browser with fast message search and filter option