REDAlert! was the first tool RED put out for viewing and transcoding RED files. Although well loved, it was a simple tool designed for a short life, and was deprecated when B30 came out in January of this year. It is no longer supported, and does not offer colour science support for B30+ or M-X cameras, nor will work with the upcoming Epic and Scarlet cameras.
REDCine-X is actively supported and developed, and also has support for the REDRocket card.