Here you can download SnapRAID. Take care that it's a command line program, without any GUI interface. If you like to use a GUI, you can try Elucidate.
|snapraid-11.3.tar.gz||Sources for Linux, Mac OS X, BSD, Solaris, OpenIndiana and any other Unix|
|snapraid-11.3-windows-x64.zip||Binaries for Windows x64 (the most recent Windows versions)|
|snapraid-11.3-windows-x86.zip||Binaries for Windows x86|
There are also Ubuntu packages in lauchpad.
If you want to show your appreciation, you can donate, or you can star it on GitHub. Donations are spent on stuffs related to SnapRAID development like to buy new hardware for my PC and internet bills.