It's possible to list these with a SEDE query, if you accept the fact that SEDE data is refreshed once a week, on Sunday morning. You'll need your network account ID, which you can find here.
For reference, here is the complete query:
-- result table, don't rename and keep the site column
create table #results (site nvarchar(250), id int, title nvarchar(250), answercount int);
declare @sql nvarchar(max) = '' -- holds build up sql string
-- build one biq union sql, for each db
select @sql = @sql
+ iif( len(@sql) > 1
, 'union'
, 'insert into #results'
) +
-- here goes the per site query, fully qualify the database objects
N'
select ''' + name + '''
, p.id, p.title, p.answercount
from ' + quotename(name) + '.dbo.posts as p
inner join ' + quotename(name) + '.dbo.users as u on p.owneruserid = u.id
where p.posttypeid = 1
and p.acceptedanswerid IS NULL
and u.accountid = ' + CAST(##AccountId:int## AS nvarchar) + ''
from sys.databases
where database_id > 5
-- and (name not like '%.Meta' or name = 'StackExchange.Meta')
-- AccountId: The global account ID of the user, which you can find in the URL of their network profile. Visit this link: https://stackexchange.com/users/current to see your own ID.
-- execute it
exec (@sql)
SELECT
LOWER('https://' +
IIF(PATINDEX('%.Mathoverflow%', site) > 0,
IIF(PATINDEX('%.Meta', site) > 0, 'meta.mathoverflow.net', 'mathoverflow.net'),
IIF(PATINDEX('%.Ubuntu%', site) > 0,
IIF(PATINDEX('%.Meta', site) > 0, 'meta.askubuntu.com', 'askubuntu.com'),
IIF(PATINDEX('StackExchange.%', site) > 0,
CASE SUBSTRING(site, 15, 200)
WHEN 'Audio' THEN 'video'
WHEN 'Audio.Meta' THEN 'video.meta'
WHEN 'Beer' THEN 'alcohol'
WHEN 'Beer.Meta' THEN 'alcohol.meta'
WHEN 'CogSci' THEN 'psychology'
WHEN 'CogSci.Meta' THEN 'psychology.meta'
WHEN 'Garage' THEN 'mechanics'
WHEN 'Garage.Meta' THEN 'mechanics.meta'
WHEN 'Moderators' THEN 'communitybuilding'
WHEN 'Moderators.Meta' THEN 'communitybuilding.meta'
WHEN 'Photography' THEN 'photo'
WHEN 'Photography.Meta' THEN 'photo.meta'
WHEN 'Programmers' THEN 'softwareengineering'
WHEN 'Programmers.Meta' THEN 'softwareengineering.meta'
WHEN 'Vegetarian' THEN 'vegetarianism'
WHEN 'Vegetarian.Meta' THEN 'vegetarianism.meta'
WHEN 'Writers' THEN 'writing'
WHEN 'Writers.Meta' THEN 'writing.meta'
ELSE SUBSTRING(site, 15, 200)
END + '.stackexchange.com',
IIF(PATINDEX('StackOverflow.%', site) > 0,
CASE SUBSTRING(site, 15, 200)
WHEN 'Br' THEN 'pt'
WHEN 'Br.Meta' THEN 'pt.meta'
ELSE SUBSTRING(site, 15, 200)
END + '.stackoverflow.com',
IIF(PATINDEX('%.Meta', site) > 0,
'meta.' + SUBSTRING(site, 0, PATINDEX('%.Meta', site)) + '.com',
site + '.com'
)
)
)
)
)
)
+ '/q/' + CAST(id AS NVARCHAR)
+ '|' + title,
answercount AS [Number of answers]
FROM #results
ORDER BY answercount DESC