I was contacted by a customer regarding where to find the list of all applications supported by FTD, the data sheet says around 4000 apps, I only could find the old listing for AVC on https://tools.cisco.com/security/center/avc.x , is this the only list out there? it only has 1390 applications listed
As noted in the latest VDB (currently #325), "Cisco Vulnerability Database (VDB) Update 325 supports 3,619 applications." When I create an ACP rule on a Firepower Management Center (version 18.104.22.168 with VDB 325), I see there are 3,527 applications that can be selected for use in the rule. I'm guessing a few can be detected but not used in ACP rules due to some characteristic intrinsic to their nature.
As far as detection (vs. vulnerability detection and use in ACP rules), the method that @Ajay Saini mentioned works. There are currently 6850 application detectors in Firepower 22.214.171.124.