Downloading Janetter Pro 4.4 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. The actual developer of this Mac application is Jane, Inc.
The application lies within Communication Tools, more precisely Social & Blogging. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
Janetter Pro is a Twitter client application for your Mac. The program gives you the ability to modify the wallpaper, font (style and size) and even the display format. The program supports multiple accounts and allows you to receive pop-up notices for new Tweets.
You may want to check out more Mac applications, such as RiffMaster Pro, Sequel Pro or WASEL Pro, which might be related to Janetter Pro.