Some important FND Tables

Here is the list of few important tables.
Concurrent Manager
FND_CONCURRENT_QUEUES
FND_CONCURRENT_PROGRAMS
FND_CONCURRENT_REQUESTS
FND_CONCURRENT_PROCESSES
FND_CONCURRENT_QUEUE_SIZE

FND
FND_APPL_TOPS
FND_LOGINS
FND_USER
FND_DM_NODES
FND_TNS_ALIASES
FND_NODES
FND_RESPONSIBILITY
FND_DATABASES
FND_UNSUCCESSFUL_LOGINS
FND_LANGUAGES
FND_APPLICATION
FND_PROFILE_OPTION_VALUES

AD / Patches
AD_APPLIED_PATCHES
AD_PATCH_DRIVERS
AD_BUGS AD_INSTALL_PROCESSES
AD_SESSIONS
AD_APPL_TOPS