The below script can be used to find the count of users linked to each EBS application. You can also filter and get information for the specific application.
select apl.application_name,
decode(ins.status,
'I',
'Installed',
'S',
'Shared',
'N',
'Not License') status,
count(distinct usr.user_id) Active_User_Count
from apps.fnd_product_installations ins,
apps.fnd_application_tl apl,
apps.fnd_user_resp_groups grp,
apps.fnd_user usr,
apps.fnd_responsibility_tl res,
apps.fnd_responsibility rss
where ins.application_id = apl.application_id
and apl.application_id = res.application_id
and grp.RESPONSIBILITY_ID=res.responsibility_id
and rss.responsibility_id=res.responsibility_id
and usr.user_id=grp.user_id
and ins.status in ('I','S')
--and apl.application_name = 'Cash Management'
and (usr.end_date is null or usr.end_date>sysdate)
and (grp.END_DATE is null or grp.END_DATE> sysdate)
and (rss.END_DATE is null or rss.END_DATE> sysdate)
group by apl.application_name,
decode(ins.status,
'I',
'Installed',
'S',
'Shared',
'N',
'Not License')
order by 2;
It will give output like below; 
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