All Rebex component DLLs are managed .NET assemblies that can be used by .NET applications which run on Common Language Runtime (CLR) virtual machine such .NET Framework, .NET Core or Mono.
On Linux, you can use Mono or .NET Core to create applications that use Rebex DLLs.
Please note that ".NET 4.0" versions of Rebex DLLs are suitable for Mono on Linux (in addition to .NET Framework 4.x on Windows), and ".NET Standard 1.5" versions of Rebex DLLs are suitable for .NET Core 1.1 and .NET Core 2.0 (on Linux, Windows and macOS).