The 3.2.4 version of ReadKit for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this Mac application is Webin. We recommend checking the downloaded files with any free antivirus. The software is included in Internet & Network Tools.
From the developer:
ReadKit is a RSS reader that supports services from Instapaper, Pocket, Readability, Pinboard, Delicious, Feedly, Fever, NewsBlur, Feedbin, and Feed Wrangler.
You may want to check out more Mac applications, such as Keep Everything, which might be similar to ReadKit.