NOTE: Open Fortress' servers are currently down, and downloads will not work. You can point murse to another server using -u. Open Fortress themselves have failed to update their launcher files since August and will be outdated.
murse is a rewrite of ofatomic by int. For many it should be a drop-in replacement, but some flags are stubs (because of optimisations and different behaviour). In our testing it's about twice as fast as ofatomic, and is not only much more reliable but less buggy and resource intensive.