Sono Key 1.5.5.205 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions among the program users are 1.5, 1.3 and 1.2.
We recommend checking the downloaded files with any free antivirus. The program is included in Communication Tools. TobiiContentUtility.exe is the frequent file name to indicate the Sono Key installer. This free software is an intellectual property of Tobii Technology.
From the developer:
Tobii Sono Key offers intuitive and coherent access to all functions of your communication device. With Tobii Sono Key it is easy to chat, send emails, hold a conversation, call a friend, surf the web, play games, read, use social media or simply write down your thoughts
You may want to check out more software, such as Sonos Desktop Controller, Kreate-A-Key or SQLite Foreign Key Enforcer AIR, which might be similar to Sono Key.