Vianat 1.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Vianat lies within System Utilities, more precisely Remote Computing. The actual developer of the free program is SWsoft-NSU lab.
The following version: 1.0 is the most frequently downloaded one by the program users. 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:
A VNC-based tool for accessing your desktop from remote computer. The connection is made via a configurable relay server, so your target machine can be hidden behind a proxy, firewall or NAT - whatever. The distribution contains a binary of a relaying server, which can be installed on a corporate network PC or on a stand-alone server.
You may want to check out more software, such as MOSS Explorer Beta or MOSS Load Test, which might be similar to Vianat.