Hi jfritz-
Unfortunately no, Citadel 5 is not available for free download. The Developer Zone Tutorial below contains more information about obtaining it:
The Citadel 4 database came with the Logos communication drivers so any computer that had Logos installed (which can be downloaded at no charge) could easily communicate with a Citadel 4 database on a remote server. Due to licensing issues associated with the tools used to build Citadel 5, Logos can no longer be distributed at no charge. The most cost-effective solution for easy remote data access is to purchase the LabVIEW DSC Module Run-Time System for all client computers. This will install the Citadel 5 database on the client computers and allow easy ODBC queries to remote Citadel 5 databases.
If purchasing the LabVIEW DSC Module Run-Time System for the client computers is not an option for your system, the following technique provides a mechanism for remotely accessing Citadel 5 data from a client that does not have the Citadel 5 database installed. The only requirement for the client is that the program trying to remotely access a Citadel 5 database must support ActiveX communication.
Hope this helps!
Drew Pierce | District Manager, Central Texas | National Instruments