There are a number of different checksum algorithms. Did you have anything particular in mind?
> I have win 10 and the ones I downloaded seem to want older .NET software installed.
Windows 10 comes with .NET Framework 4.6. If the programs you are finding need an older version you can install the older version alongside that version. (1.1, 2.0, 3.0, 3.5, 4.0, 4.5, etc).
You can also add .NET 2.0 and 3.5 via "Turn Windows Features on or off".