Do your own DD.

Here is the full directory of companies in the same schedule as Crossflow (70, GENERAL PURPOSE COMMERCIAL INFORMATION TECHNOLOGY EQUIPMENT, SOFTWARE, AND SERVICES):

http://www.gsaelibrary.gsa.gov/ElibM...

Here are the categories Crossflo Systems, Inc is listed as qualified for in GS-35F-0314V:

132 32 Term Software License - SUBJECT TO COOPERATIVE PURCHASING
471 Contractors, Crossflo not currently listed.

132 34 Maintenance of Software as a Service -SUBJECT TO COOPERATIVE PURCHASING
1,109 Contractors, Crossflo listed, no catalog.

132 50 Training Courses - SUBJECT TO COOPERATIVE PURCHASING
820 Contractors, Crossflo listed, no catalog

132 51 Information Technology Professional Services - SUBJECT TO COOPERATIVE PURCHASE
3,481 Contractors, Crossflo listed, no catalog.

Until they get catalogs up, it is diffidcult to tell who exactly their direct competitors are for GSA contracts but this is a start. It is hardly what I'd call a short list.