Echosync is a portable software which means that it can be used without prior installation. Just unzip the Echosync archive to the location of your choice (like a USB key), avoiding choosing a folder that requires administrator privileges to write to (like the Program Files folder).
Echosync is developed in C#/WPF and requires prior installation of the .NET Framework (in its version 4.7.2 or higher), compatible with Windows 7 or later.
Echosync is available in English, French, Italian, Spanish, German, Chinese and Russian.
Echosync is entirely free. It contains no spyware, adware or other malware. There is not even any advertising on this site. The author, who bears the full development and hosting costs, is encouraged and supported only by the donations made to him, via the Echosync PayPal money pool, by those who appreciate his software. A big thank you to them!