Hi Sherry,
Third party tools will need to be updated to support some new MongoDB 3.0 features such as SCRAM-SHA-1 authentication (new default authentication scheme) and the WiredTiger storage engine.
There are some vendors who have already updated with 3.0 support for the RCs and I'd expect that others will be working on doing so. In most cases this involves updating the underlying MongoDB driver to a 3.0-compatible version, but there are additional changes that might need to be reflected in an admin UI.
One cross-platform GUI that I'm aware of that already has MongoDB 3.0 support is MongoChef:
http://3t.io/mongochef.
Regards,
Stephen