The Community Option:

By creating a new account, users automatically get access to a 14-day trial of the Commercial version of our product with advanced Malware Detection and EmergingThreats “GPL” rules or SourceFire VRT rules. After 14 days, some of the features will drop off automatically and the user will enjoy free access to the community version (no questions asked). Upgrading to the Commercial version can be done very easily, at any time, through the Browser to get the features listed below.

The MSS sensor software can run on Linux (CentOS 6 preferred) or as a virtual machine using VMware. It can process 6000-7000 rules @500-800 Mbps with  an Intel I7 950 processor or @3-5 Gbps with a dual Xeon system.