SVNManagerLib:
http://www.codeplex.com/svnmanagerlib
The goal of SVNManagerLib is to create a kernel type library that can be used by .NET Web Services, Remoting, and ASP.NET for remotely administering Subversion repositories and users.
PainlessSVN:
http://www.systemwidgets.com/
Utilizing Microsoft's newest MMC ver 3.0, this utility provides you with the ability to completely manage your SVN Repositories & Server conviently and effectively without the hassle of command-line switches.
SubversionSharp:
http://www.softec.st/en/OpenSource/ClrProjects/SubversionSharp/SubversionSharp.html
SubversionSharp is a C# wrapper that fully covers the client API of Subversion SCM.
SVN.NET:
http://www.pumacode.org/projects/svndotnet
This is a project to build reliable .NET bindings for the
Subversion version-control system libraries. This is a continuation of the
SubversionSharp library initially created by
Softec and released under the
LGPL.