If you are using Oracle as content store DB
here are some homemade select that could give you some information
list of users
SELECT cmobjprops1.cmid, cmobjprops1.busphone, cmobjprops1.email,
cmobjprops1.faxphone, cmobjprops1.givenname, cmobjprops1.homephone,
cmobjprops1.mobilephone, cmobjprops1.pagerphone,
cmobjprops1.paddress, cmobjprops1.surname, cmobjprops1.TIMEZONE,
cmobjprops1.clocaleid, cmobjprops1.prodlocale, cmobjprops1.objid,
cmobjprops1.useaccessibility, cmobjprops33.cmid AS cmid1,
UPPER (cmobjprops33.NAME)
FROM cmobjprops1, cmobjprops33
WHERE cmobjprops1.cmid = cmobjprops33.cmid
List of Groups (List of English groups)
SELECT cmobjnames_base.cmid, cmobjects.pcmid, UPPER (cmobjnames_base.NAME),
cmobjects.created, cmobjects.modified, cmobjects.disabled,
cmobjnames_base.isdefault
FROM cmobjects, cmobjnames_base
WHERE cmobjects.classid IN (26, 54)
AND cmobjnames_base.mapdlocaleid = 24
AND cmobjects.cmid = cmobjnames_base.cmid
List of users by group
SELECT v_group_user.user_id, v_user.ldap_id,
LTRIM (RTRIM (UPPER (v_user.ldap_id))), v_group.cmid,
v_group.name_en name_en, v_group.name_fr name_fr, v_group.created,
v_group.modified, v_group.disabled, v_user.last_name,
v_user.first_name, v_user.email
FROM dba_group_info v_group,
(SELECT cmid GROUP_ID, refcmid user_id
FROM ops$cgs.cmreford1) v_group_user,
(SELECT c33.cmid user_id, UPPER (c33.NAME) ldap_id,
c1.surname last_name, c1.givenname first_name,
c1.email email
FROM cmobjprops1 c1, cmobjprops33 c33
WHERE c33.cmid = c1.cmid(+)
UNION
SELECT cmid user_id, UPPER (name_en) ldap_id, name_en last_name,
'' first_name, '' email
FROM dba_group_info) v_user
WHERE v_group.cmid = v_group_user.GROUP_ID
AND v_group_user.user_id = v_user.user_id(+)
ORDER BY 1, 3
I hope this will help you