This service will remain free and is currently advertisement supported. We are considering a very low cost additional service which provides you with a full administrative access. Let us know if there is any interest in the community for this service.
We are long-term users of Redmine and are hosting this service as a contribution to the community. This service can be used for commercial purposes. Your data is private and will be kept confidential. This service runs from a Virtual Private Server (VPS) in the United States, and only BitBot Software Pty Ltd (an Australian company) has data access. You may request an SQL backup of your data on this service for a fee of AU$50 (as we have to separate your data from everyone else's). If we are forced to close down the service for any reason, we will provide an SQL backup free of charge, on request.
If you are just looking to experiment with Redmine's features, we recommend you use the official demo instead: http://demo.redmine.org/
Any inappropriate use (such as spamming) will be monitored and your access may be permanently blocked at our sole discretion. The service is provided "as is", without warranty of any kind, express or implied.