Downloading Yack 56.4 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. Yack for Mac is included in Internet & Network Tools. This free software for Mac OS X is an intellectual property of CommunityKit, Inc. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
Yack lets you explore your favorite communities from a single elegant desktop app with a unified user interface. It is a unified community app for Reddit, Hacker News, RSS feeds and many more. Its UI design and innovative features make exploring your favorite communities faster, more intuitive, and fun.
You may want to check out more software for Mac, such as Mint, NetSurf or Stack Exchange Notifier, which might be similar to Yack.