There was a download of NetUno 4.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. The common filename for the program's installer is NetUno.exe. This free program is a product of SF-Games. The most popular versions among the software users are 4.0 and 0.0. NetUno lies within Games, more precisely Card.
From the developer:
NetUno is the classic, fast action card game, designed for internet and player vs. computer play. Hours of fast paced fun alone or with friends. With such features as auto card sorting, sound toggle, background color selection, rule variations, Configurable maximum game score, online registration with web site displayed statistics for competitions as well as a local statistics database.
You may want to check out more software, such as Eleven Home Edition, Greek Goddesses of Solitaire or SpiteNET: Spite and Malice, which might be similar to NetUno.