ConfuserEx is still alive and kicking. The updated version 1.1 contains mostly bugfixes. The big thing is the update of dnlib to version 3. This allows ConfuserEx to work with the new portable debug symbol files and with .NET Core assemblies.
There are also some bugfixes, highlights being the compressor being able to handle satellite assemblies propertly (at least with .NET Framework >= 4.0) and the XAML renaming handling more.
You can review all changes done here: Changes in v1.1.0
You can also get the bleeding edge builds from the CI Server!!!